Clean up and enhancement of Actor re-design

Added junits for the remaining code.

Enhancements to facilitate implementation of Operators:
- Added allOf(), anyOf() facilities
- Added AsyncResponseHandler for handling asynchronous I/O via the
  HttpClient
- Added logRestRequest() and logRestResponse() for logging REST
  requests and responses
- Added HttpActor and HttpOperator, which can be used as superclasses
- Added doTask()
- Lifted data from the event into ControlLoopEventContext

Updates per previous review comments:
- Changed logException() to runFunction().
- Removed the aaiCqResponse field.
- Lifted fields from Policy into ControlLoopOperationParams, eliminating
  the need to include Policy in the class.

OperatorPartial depends on the string values in the ControlLoopOperation
being set to one of the string values of PolicyResult.  Instead of
passing ControlLoopOperation around, the operators should pass around
an object that uses PolicyResult directly, rather than depending on
the string values being set correctly.  Created OperationOutcome for
this purpose.
Stop pipeline when the controller completes.
Use whenComplete() where appropriate.
startOperationAsync() should not block.  Modified it to launch the task
in the background via its own thread.
Extracted CallbackManager into its own file.
Replaced actor setOperators() with addOperator()
Renamed add() to wrap(), and modified it to remove the future when it
completes.
Fixed the signature on delayedRemove() and delayedComplete().
Replaced xxxAsync() calls with just xxx() calls, where appropriate to
avoid the extra overhead of submitting it to a work queue.
Renamed handleFailure() to handlePreprocessorFailure().
Updates per WIP review comments

Issue-ID: POLICY-1625
Signed-off-by: Jim Hahn <jrh3@att.com>
Change-Id: Id4c4c7ade979bdb76cc54266837609cc69a22c58

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