restapi: Deprecate replace brick from API

The replace brick action is no longer supported in
gluster. User needs to migrate and remove brick
instead.
Marking the API as deprecated.

Change-Id: I5ce8126324a6e9575d978cbdd136e78a6bd90626
Bug-Url: https://bugzilla.redhat.com/957602
Signed-off-by: Sahina Bose <sabose@redhat.com>