Comment 12 for bug 1762431

With ~openstack-charmers-next/neutron-api-337, deployment succeeds and the CA is considered the same as existing one properly.
https://api.jujucharms.com/charmstore/v5/~openstack-charmers-next/neutron-api-337/archive/repo-info

# grep 'CA cert' /var/log/juju/unit-neutron-api-0.log
2018-04-11 05:53:14 INFO juju-log Installing new CA cert
...
2018-04-11 13:10:42 INFO juju-log CA cert is the same as installed version
2018-04-11 13:16:18 INFO juju-log CA cert is the same as installed version
2018-04-11 13:21:10 INFO juju-log CA cert is the same as installed version
2018-04-11 13:25:46 INFO juju-log CA cert is the same as installed version
2018-04-11 13:30:16 INFO juju-log CA cert is the same as installed version
2018-04-11 13:36:07 INFO juju-log CA cert is the same as installed version