The 'got_stop' and 'got_resume' global variables apply to the src and
dst migration VM respectively. Change their names to make this explicit
to developers.

Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20230601161347.1803440-9-berrange@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>