Neutron-interconnection project has no activity since very long time.
There is no any implementation done in the repo so far.
So during the Shanghai PTG, we agreed that we will drop
neutron-inteconnection project from stadium projects list and
remove its api-ref from neutron-lib.
This partially reverts commit 888a28d598.
It don't rever original release note and adds new release note about
removal of interconnection API from neutron-lib.
Change-Id: I186a8f42e1d387bfb31025b0c5c224a86d00cd6e
1fc1f0eae4