Get rid of ambiguities about exactly what object is being used to send calls to the scheduler. (See AURORA-42).

Also do some cleanups of sloppy stuff in tests.

Testing Done:
============================= test session starts ==============================
platform darwin -- Python 2.7.5 -- pytest-2.5.1
collected 3 items

src/test/python/apache/aurora/admin/test_mesos_maintenance.py ...

=========================== 3 passed in 0.18 seconds ===========================
============================= test session starts ==============================
platform darwin -- Python 2.7.5 -- pytest-2.5.1
collected 2 items

src/test/python/apache/aurora/client/test_binding_helper.py ..

=========================== 2 passed in 0.19 seconds ===========================
============================= test session starts ==============================
platform darwin -- Python 2.7.5 -- pytest-2.5.1
collected 6 items

src/test/python/apache/aurora/client/test_config.py ......

=========================== 6 passed in 0.26 seconds ===========================
============================= test session starts ==============================
platform darwin -- Python 2.7.5 -- pytest-2.5.1
collected 6 items

src/test/python/apache/aurora/client/api/test_disambiguator.py ......

=========================== 6 passed in 0.18 seconds ===========================
============================= test session starts ==============================
platform darwin -- Python 2.7.5 -- pytest-2.5.1
collected 1 items

src/test/python/apache/aurora/client/api/test_job_monitor.py .

=========================== 1 passed in 0.15 seconds ===========================
============================= test session starts ==============================
platform darwin -- Python 2.7.5 -- pytest-2.5.1
collected 6 items

src/test/python/apache/aurora/client/api/test_restarter.py ......

=========================== 6 passed in 0.16 seconds ===========================
============================= test session starts ==============================
platform darwin -- Python 2.7.5 -- pytest-2.5.1
collected 47 items / 1 skipped

src/test/python/apache/aurora/client/api/test_scheduler_client.py ...............................................

===================== 47 passed, 1 skipped in 0.53 seconds =====================
============================= test session starts ==============================
platform darwin -- Python 2.7.5 -- pytest-2.5.1
collected 20 items

src/test/python/apache/aurora/client/api/test_instance_watcher.py ........
src/test/python/apache/aurora/client/api/test_health_check.py ............

========================== 20 passed in 0.16 seconds ===========================
============================= test session starts ==============================
platform darwin -- Python 2.7.5 -- pytest-2.5.1
collected 26 items

src/test/python/apache/aurora/client/api/test_updater.py ..........................

========================== 26 passed in 0.36 seconds ===========================
============================= test session starts ==============================
platform darwin -- Python 2.7.5 -- pytest-2.5.1
collected 6 items

src/test/python/apache/aurora/client/api/test_quota_check.py ......

=========================== 6 passed in 0.06 seconds ===========================
============================= test session starts ==============================
platform darwin -- Python 2.7.5 -- pytest-2.5.1
collected 17 items

src/test/python/apache/aurora/client/cli/test_create.py ....
src/test/python/apache/aurora/client/cli/test_kill.py .....
src/test/python/apache/aurora/client/cli/test_status.py .....
src/test/python/apache/aurora/client/cli/test_diff.py ...

========================== 17 passed in 0.48 seconds ===========================
============================= test session starts ==============================
platform darwin -- Python 2.7.5 -- pytest-2.5.1
collected 24 items

src/test/python/apache/aurora/client/commands/test_cancel_update.py ..
src/test/python/apache/aurora/client/commands/test_create.py ......
src/test/python/apache/aurora/client/commands/test_diff.py ...
src/test/python/apache/aurora/client/commands/test_kill.py ...
src/test/python/apache/aurora/client/commands/test_listjobs.py ..
src/test/python/apache/aurora/client/commands/test_restart.py ...
src/test/python/apache/aurora/client/commands/test_status.py ..
src/test/python/apache/aurora/client/commands/test_update.py ...

========================== 24 passed in 0.78 seconds ===========================
============================= test session starts ==============================
platform darwin -- Python 2.7.5 -- pytest-2.5.1
collected 1 items

src/test/python/apache/aurora/client/commands/test_run.py .

=========================== 1 passed in 0.22 seconds ===========================
============================= test session starts ==============================
platform darwin -- Python 2.7.5 -- pytest-2.5.1
collected 1 items

src/test/python/apache/aurora/client/commands/test_ssh.py .

=========================== 1 passed in 0.22 seconds ===========================
============================= test session starts ==============================
platform darwin -- Python 2.7.5 -- pytest-2.5.1
collected 12 items

src/test/python/apache/aurora/client/hooks/test_hooked_api.py ............

========================== 12 passed in 0.17 seconds ===========================
============================= test session starts ==============================
platform darwin -- Python 2.7.5 -- pytest-2.5.1
collected 4 items

src/test/python/apache/aurora/client/hooks/test_non_hooked_api.py ....

=========================== 4 passed in 0.16 seconds ===========================
============================= test session starts ==============================
platform darwin -- Python 2.7.5 -- pytest-2.5.1
collected 1 items

src/test/python/apache/aurora/common/test_aurora_job_key.py .

=========================== 1 passed in 0.03 seconds ===========================
============================= test session starts ==============================
platform darwin -- Python 2.7.5 -- pytest-2.5.1
collected 1 items

src/test/python/apache/aurora/common/test_cluster.py .

=========================== 1 passed in 0.02 seconds ===========================
============================= test session starts ==============================
platform darwin -- Python 2.7.5 -- pytest-2.5.1
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src/test/python/apache/aurora/common/test_clusters.py ....

=========================== 4 passed in 0.08 seconds ===========================
============================= test session starts ==============================
platform darwin -- Python 2.7.5 -- pytest-2.5.1
collected 2 items

src/test/python/apache/aurora/common/test_cluster_option.py ..

=========================== 2 passed in 0.03 seconds ===========================
============================= test session starts ==============================
platform darwin -- Python 2.7.5 -- pytest-2.5.1
collected 3 items

src/test/python/apache/aurora/common/test_http_signaler.py ...

=========================== 3 passed in 0.05 seconds ===========================
============================= test session starts ==============================
platform darwin -- Python 2.7.5 -- pytest-2.5.1
collected 7 items

src/test/python/apache/aurora/config/test_base.py .......

=========================== 7 passed in 0.70 seconds ===========================
============================= test session starts ==============================
platform darwin -- Python 2.7.5 -- pytest-2.5.1
collected 1 items

src/test/python/apache/aurora/config/test_constraint_parsing.py .

=========================== 1 passed in 0.06 seconds ===========================
============================= test session starts ==============================
platform darwin -- Python 2.7.5 -- pytest-2.5.1
collected 6 items

src/test/python/apache/aurora/config/test_loader.py ......

=========================== 6 passed in 0.11 seconds ===========================
============================= test session starts ==============================
platform darwin -- Python 2.7.5 -- pytest-2.5.1
collected 10 items

src/test/python/apache/aurora/config/test_thrift.py ..........

========================== 10 passed in 0.87 seconds ===========================
============================= test session starts ==============================
platform darwin -- Python 2.7.5 -- pytest-2.5.1
collected 4 items

src/test/python/apache/aurora/executor/test_executor_detector.py ....

=========================== 4 passed in 0.04 seconds ===========================
============================= test session starts ==============================
platform darwin -- Python 2.7.5 -- pytest-2.5.1
collected 4 items

src/test/python/apache/aurora/executor/test_executor_vars.py ....

=========================== 4 passed in 0.10 seconds ===========================
============================= test session starts ==============================
platform darwin -- Python 2.7.5 -- pytest-2.5.1
collected 5 items

src/test/python/apache/aurora/executor/test_thermos_task_runner.py .....

========================== 5 passed in 16.81 seconds ===========================
============================= test session starts ==============================
platform darwin -- Python 2.7.5 -- pytest-2.5.1
collected 2 items

src/test/python/apache/aurora/executor/common/test_directory_sandbox.py ..

=========================== 2 passed in 0.04 seconds ===========================
============================= test session starts ==============================
platform darwin -- Python 2.7.5 -- pytest-2.5.1
collected 3 items

src/test/python/apache/aurora/executor/common/test_health_checker.py ...

=========================== 3 passed in 1.33 seconds ===========================
============================= test session starts ==============================
platform darwin -- Python 2.7.5 -- pytest-2.5.1
collected 1 items

src/test/python/apache/aurora/executor/common/test_status_checker.py .

=========================== 1 passed in 0.04 seconds ===========================
============================= test session starts ==============================
platform darwin -- Python 2.7.5 -- pytest-2.5.1
collected 1 items

src/test/python/apache/aurora/executor/common/test_task_info.py .

=========================== 1 passed in 0.13 seconds ===========================
Build operating on targets: OrderedSet([PythonTestSuite(src/test/python/apache/aurora/BUILD:all)])
src.test.python.apache.aurora.admin.mesos_maintenance                           .....   SUCCESS
src.test.python.apache.aurora.client.api.disambiguator                          .....   SUCCESS
src.test.python.apache.aurora.client.api.instance_watcher                       .....   SUCCESS
src.test.python.apache.aurora.client.api.job_monitor                            .....   SUCCESS
src.test.python.apache.aurora.client.api.quota_check                            .....   SUCCESS
src.test.python.apache.aurora.client.api.restarter                              .....   SUCCESS
src.test.python.apache.aurora.client.api.scheduler_client                       .....   SUCCESS
src.test.python.apache.aurora.client.api.updater                                .....   SUCCESS
src.test.python.apache.aurora.client.binding_helper                             .....   SUCCESS
src.test.python.apache.aurora.client.cli.job                                    .....   SUCCESS
src.test.python.apache.aurora.client.commands.core                              .....   SUCCESS
src.test.python.apache.aurora.client.commands.run                               .....   SUCCESS
src.test.python.apache.aurora.client.commands.ssh                               .....   SUCCESS
src.test.python.apache.aurora.client.config                                     .....   SUCCESS
src.test.python.apache.aurora.client.hooks.hooked_api                           .....   SUCCESS
src.test.python.apache.aurora.client.hooks.non_hooked_api                       .....   SUCCESS
src.test.python.apache.aurora.common.test_aurora_job_key                        .....   SUCCESS
src.test.python.apache.aurora.common.test_cluster                               .....   SUCCESS
src.test.python.apache.aurora.common.test_cluster_option                        .....   SUCCESS
src.test.python.apache.aurora.common.test_clusters                              .....   SUCCESS
src.test.python.apache.aurora.common.test_http_signaler                         .....   SUCCESS
src.test.python.apache.aurora.config.test_base                                  .....   SUCCESS
src.test.python.apache.aurora.config.test_constraint_parsing                    .....   SUCCESS
src.test.python.apache.aurora.config.test_loader                                .....   SUCCESS
src.test.python.apache.aurora.config.test_thrift                                .....   SUCCESS
src.test.python.apache.aurora.executor.common.directory_sandbox                 .....   SUCCESS
src.test.python.apache.aurora.executor.common.health_checker                    .....   SUCCESS
src.test.python.apache.aurora.executor.common.status_checker                    .....   SUCCESS
src.test.python.apache.aurora.executor.common.task_info                         .....   SUCCESS
src.test.python.apache.aurora.executor.executor_detector                        .....   SUCCESS
src.test.python.apache.aurora.executor.executor_vars                            .....   SUCCESS
src.test.python.apache.aurora.executor.thermos_task_runner                      .....   SUCCESS

Bugs closed: aurora-42

Reviewed at https://reviews.apache.org/r/16984/