Description of problem: Running an update of osp16 from  RHOS_TRUNK-16.0-RHEL-8-20191126.n.2 to RHOS_TRUNK-16.0-RHEL-8-20191202.n.1 fails during undercloud update.

We can see in the log that it complains about duplicate names:

ve that container to be able to reuse that name.: that name is already in use",
2019-12-03 17:27:02 |         "Error: error creating container storage: the container name \"memcached\" is already in use by \"bb0638a63d84ed719d576624f95dcf3d9521d4a655b74ddcdc64dcc6ddd27e84\". You have to remove that container to be able to reuse that name.: that name is already in use",
2019-12-03 17:27:02 |         "Error: error creating container storage: the container name \"mysql_init_logs\" is already in use by \"9bb81cebadcb7a4e7afeab6f3f1600bacc1e2b237fd74dbb0f8a659c98325967\". You have to remove that container to be able to reuse that name.: that name is already in use",
2019-12-03 17:27:02 |         "Error: error creating container storage: the container name \"rabbitmq_init_logs\" is already in use by \"abc5350ea02291218b86c87f4afa5a4c513308f82bcc703fa83331cb70eeb701\". You have to remove that container to be able to reuse that name.: that name is already in use",
2019-12-03 17:27:02 |         "Error: error creating container storage: the container name \"haproxy\" is already in use by \"2958ec5c6fc33d95c8f485d96adf4e4465cc8151b452e0693ff00b52d09a81b2\". You have to remove that container to be able to reuse that name.: that name is already in use",
2019-12-03 17:27:02 |         "Error: error creating container storage: the container name \"rabbitmq_bootstrap\" is already in use by \"fa680fe45eaed067b1f6d84d96ff5486e64a19759f2a3feebf4d70642edb778b\". You have to remove that container to be able to reuse that name.: that name is already in use",
2019-12-03 17:27:02 |         "Error: error creating container storage: the container name \"rabbitmq\" is already in use by \"ac397bd2269c63aa7550e25e2dd95534319e6ee8c4f2ad045bb44580c9a35f74\". You have to remove that container to be able to reuse that name.: that name is already in use"