Add terminate support to orchestrator and ncm

Add terminate support to orchestrator and ncm

Complete the basic terminate support for the
orchestrator and ncm services.

1. When terminate REST API is invoked on a deployment
   intent group, call the uninstall grpc api to rsync
   and then remove the app context.

2. When terminate REST API is invoked on a cluster,
   add the uninstall grpc api call to rsync to remove
   the network resources from the clusters.

Issue-ID: MULTICLOUD-1040
Signed-off-by: Eric Multanen <eric.w.multanen@intel.com>
Change-Id: I181e891a8c7c973970af061f9ff07d80c3bb64f9