XD-1545 Acc testing for multiple containers

1. Test no longer relies on artifact to know what containers are available.  This is queried from admin.
2. Test finds the container where source, processor, job & sink modules are deployed.
3. Mapped ec2 internal dns to external dns.
4. Tests handle x containers for source & job file based tests.
5. Sample properties container settings have been removed.
6. jclouds-ec2 dependency added to build.gradle.  It is compile time since it is utility based.
XD-1849: Move executions by name
XD-1849 Move launch endpoint
XD-1849 Changes on merge

- Make job launch as `POST` request
  - Update BatchJobExecutionsController
  - Fix test
  - Update REST client - `JobTemplate` method for job launch
  - Update job service in the admin UI
- Move the job launch test to `BatchJobExecutionsControllerIntegrationTests`
Use ZooKeeperUtils for map<->bytes conversion
MapBytesUtility now private inner class
fixed compile warnings

Updated to use new (un-deprecated) methods
XD-1306 Moved RemoteFile classes from dirt to spring-xd-extension-batch
Update Jolokia dependency to use IO platform

- Update `spring-xd-dirt` jolokia dependency to use `jolokia-core` artifact
so that Spring IO platform version (currently `1.2.2`) gets updated
automatically.
- Remove explicit version update
XD-1942 - Use guava 15.0 for spring-xd-integration-test
XD-1939 - Update to Spring Batch Admin 1.3.0.RC1
XD-1941 Re-enabled Boot repackaging for spring-xd-yarn sub-projects