When managing a subcloud, allow a --force option to be
specified. The force option will allow an offline subcloud
to be managed.
This is necessary in cases where the user has (mistakenly)
unmanaged a subcloud that is offline and the subcloud
cannot be recovered while it is unmanaged. One example is
a failure during DC upgrade orchestration that leaves the
subcloud offline. To rerun upgrade orchestration and
recover the subcloud, the subcloud must be managed.
Story: 2007403
Task: 40467
Change-Id: I0c0fa0f489208c322b463d0c3b889c26575d06f4
Signed-off-by: Tee Ngo <tee.ngo@windriver.com>