XD-1294 Update xd reactor dependency

- Move the reactor Environment bean definition out of module common context
- Remove the 'spring-xd-extension-reactor' runtime dependency from spring-xd-dirt
- Add back 'spring-xd-extension-reactor' runtime dependency to reactor-syslog module

Add reactorEnv bean to syslog module

- Add the reactor environment bean to the reactor-syslog source
module so that the reactor environment is only loaded when this
module is deployed.
XD-1316 UI:Fix E2E test warning
Update xd ui test task

 Rename ui test task to 'ui_test' so that gradle test won't
  call spring-xd-ui tests. To run the E2E tests, the ui_test
  task needs to be invoked explicitly.
 The 'ui_test' task will also build the UI and runs the unit tests
  as it depends on 'grunt_build'

 Once we have valid UI tests, we will rename the task ui_test to 'test'
  so that will run as a 'test' task.
XD-804 Added integration.support package to dirt and used in AbstractSingleNode...Tests

XD-804. Refactored SingleNodeTestSupport and SingleNodeApplication per review

XD-804 Renamed package integration.test and added module resource location support

XD-804 Updated javadocs and added moduleResourceLocation arguments to processing chain creation methods

Javadoc fixes + random ports
Refactor jdbc script tests.

Extract variables for driver, url etc.
adding missing compile dependency on hibernate-validator
XD-1245 Integration tests for XD

Updated tests.

Supporting stream creation & HTTP Post

Add send command

AssertReceive functionality is available

Classes to support the results from JMX

Cleaned up code and separated tests.

Updated documentation

Added Instructions for usage.

Added Processor to tests regime
Cleaned up the stream read code.
Adjusted the waits..

Cleaned up the JMXRequest Code for Models

Updated the readme and renamed it.
Tests now check that stream output is correct.

Docs now desc how to test against xd-singlenode

Also fixed Author tag location.

Cleaned up the code.

Fixed the instructions.
Added additional notes.