Update --remote-group-id metavar to REMOTE_GROUP
Update --remote-group-id metavar to REMOTE_GROUP

The metavar value for --remote-group-id was left out in the patch
that renamed source_(group_id|ip_prefix) to remote. This patch
renames this instance of SOURCE to REMOTE.

Change-Id: I99d538e1cdc0b29e62b499c9c8ba8b3a31d77f7a

metacloud/python-neutronclient,metacloud/python-neutronclient