Changes in preparation for the m2 model

Changes in preparation for the m2 model

1) Replace enum 'ControlLoopTargetType' with 'String' -- symbols such as
   'ControlLoopTargetType.VM' still work, but now expand into a String.
   This gives the ability to add new application-specific types.

2) Move 'ControlLoopEvent.payload' to 'VirtualControlLoopEvent'. This
   symbol isn't common to all 'ControlLoopEvent' types, and this
   definition collides with a 'payload' defined in our application.

3) Add 'RestManager.patch(...)', which performs a REST patch.

4) Add lombok getters and setters

5) Remove trailing spaces

6) Fix order of arguments in 'assertEquals' in 'ControlLoopTargetTypeTest'

7) Update Junit tests in 'RestTest' to include 'RestManager.patch(...)'

Issue-ID: POLICY-1948
Signed-off-by: Straubs, Ralph (rs8887) <rs8887@att.com>
Change-Id: I08e04ea3cbcf368c760b630bcfe23a4370cf94dc