Service layer has been simplified by removing abstraction
and making the implementation more in line with other
OpenStack projects.
Moved Heartbeat code out of Service class and
into the console scripts. We only need one instance
of the Heartbeat Emitter.
Cleaned up the WSGI code by making use of the
reusable oslo_service.wsgi code.
* Added Heartbeat to designate-sink.
* Cleaned up and refactored Service layers.
* Fixed various bugs e.g. errors on shutdown.
* Removed deprecated options host, port etc.
* Simplified Heartbeat implementation.
Closes-Bug: #1442141
Change-Id: I536b92407bf6ca5bddf4c048909cd13d4e094d26
a09064a5d1