ports left open on port config changes

[Mauricio Faria de Oliveira]

When the charm config option `port` is changed, the previously opened port is not closed.

This leads to leaks of open ports (potential security issue), and long status on tests:

$ juju config ceph-radosgw port=1111
$ juju config ceph-radosgw port=2222
$ juju config ceph-radosgw port=3333

$ juju status ceph-radosgw
...
Unit Workload Agent Machine Public address Ports Message
ceph-radosgw/1* blocked idle 3 10.5.2.210 80/tcp,1111/tcp,2222/tcp,3333/tcp Missing relations: mon
...

$ juju run --unit ceph-radosgw/1 'opened-ports'
80/tcp
1111/tcp
2222/tcp
3333/tcp

[Mauricio Faria de Oliveira (mfo)]

https://review.opendev.org/c/openstack/charm-ceph-radosgw/+/782778

[Mauricio Faria de Oliveira (mfo)]

https://opendev.org/openstack/charm-ceph-radosgw/commit/c97fced7947e55870240557ae41dad7872a3c9d2

[Mauricio Faria de Oliveira (mfo)]

The previous patch introduces a regression/needs an additional fix:

https://review.opendev.org/c/openstack/charm-ceph-radosgw/+/784785

[Mauricio Faria de Oliveira (mfo)]

Additional fix merged.
https://opendev.org/openstack/charm-ceph-radosgw/commit/358121d74c7371eafb724dc247ee620ce93cba81

Waiting on stable charm release.