Updated garbage collector tests to use new testing abstractions.

Review: https://reviews.apache.org/r/10293

git-svn-id: https://svn.apache.org/repos/asf/incubator/mesos/trunk@1467366 13f79535-47bb-0310-9956-ffa450edef68
Fixed a comment in os.hpp.

Review: https://reviews.apache.org/r/10302

git-svn-id: https://svn.apache.org/repos/asf/incubator/mesos/trunk@1467367 13f79535-47bb-0310-9956-ffa450edef68
Added a Cluster::Masters::start which takes an AllocatorProcess.

Review: https://reviews.apache.org/r/10303

git-svn-id: https://svn.apache.org/repos/asf/incubator/mesos/trunk@1467368 13f79535-47bb-0310-9956-ffa450edef68
Updated log tests to use DROP_MESSAGES.

Review: https://reviews.apache.org/r/10304

git-svn-id: https://svn.apache.org/repos/asf/incubator/mesos/trunk@1467369 13f79535-47bb-0310-9956-ffa450edef68
Updated master detector tests to use new testing abstractions.

Review: https://reviews.apache.org/r/10305

git-svn-id: https://svn.apache.org/repos/asf/incubator/mesos/trunk@1467370 13f79535-47bb-0310-9956-ffa450edef68
Updated resource offers tests to use new testing abstractions.

Review: https://reviews.apache.org/r/10306

git-svn-id: https://svn.apache.org/repos/asf/incubator/mesos/trunk@1467371 13f79535-47bb-0310-9956-ffa450edef68
Updated ZooKeeper tests to use new testing abstractions.

git-svn-id: https://svn.apache.org/repos/asf/incubator/mesos/trunk@1467372 13f79535-47bb-0310-9956-ffa450edef68
Added DROP_PROTOBUF.

Review: https://reviews.apache.org/r/10307

git-svn-id: https://svn.apache.org/repos/asf/incubator/mesos/trunk@1467373 13f79535-47bb-0310-9956-ffa450edef68
Added another Cluster::Slaves::start.

Review: https://reviews.apache.org/r/10308

git-svn-id: https://svn.apache.org/repos/asf/incubator/mesos/trunk@1467374 13f79535-47bb-0310-9956-ffa450edef68
Updated status update manager tests to use new testing abstractions.

Review: https://reviews.apache.org/r/10309

git-svn-id: https://svn.apache.org/repos/asf/incubator/mesos/trunk@1467375 13f79535-47bb-0310-9956-ffa450edef68
Cleaned up includes and using directives in master tests.

Review: https://reviews.apache.org/r/10310

git-svn-id: https://svn.apache.org/repos/asf/incubator/mesos/trunk@1467376 13f79535-47bb-0310-9956-ffa450edef68