Add new command: detach-replica

Add new command to detach a replica from its replication
source.

Partially Implements: blueprint replication-v1
Co-Authored-By: Nikhil Manchanda <SlickNik@gmail.com>
Change-Id: Ieca67f042c6bcb33f2a4de1acbb330d3eefc0600
Merge "Add new command: detach-replica"