Add --force option when managing a subcloud

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>

distributedcloud-client/dcmanagerclient/commands/v1/subcloud_manager.py

@@ -361,6 +361,14 @@ class ManageSubcloud(base.DCManagerShowOne):
             'subcloud',
             help='Name or ID of the subcloud to manage.'
         )
+
+        parser.add_argument(
+            '--force',
+            required=False,
+            action='store_true',
+            help='Disregard subcloud availability status, intended for \
+                  some upgrade recovery scenarios.'
+        )
         return parser
 
     def _get_resources(self, parsed_args):
@@ -368,6 +376,9 @@ class ManageSubcloud(base.DCManagerShowOne):
         dcmanager_client = self.app.client_manager.subcloud_manager
         kwargs = dict()
         kwargs['management-state'] = 'managed'
+        if parsed_args.force:
+            kwargs['force'] = 'true'
+
         try:
             return dcmanager_client.subcloud_manager.update_subcloud(
                 subcloud_ref, files=None, data=kwargs)