cinder-ceph does not re-request pool on replicas factor change

[Guillaume Boutry]

Updating ceph-osd-replication-count configuration option on cinder ceph does not updates pool in microceph.

juju config -m openstack cinder-ceph ceph-osd-replication-count
3

juju show-unit cinder-ceph/0 --endpoint ceph

- relation-id: 3
    endpoint: ceph
    cross-model: true
    related-endpoint: ceph
    application-data: {}
    related-units:
      remote-c84086f104fb46318e95496ba6cfc69c/0:
        in-scope: true
        data:
          application-name: cinder-ceph
          broker_req: '{"api-version": 1, "ops": [{"op": "create-pool", "name": "cinder-ceph",
            "replicas": 1, "pg_num": null, "crush-profile": null, "app-name": "rbd",
            "compression-algorithm": null, "compression-mode": null, "compression-required-ratio":
            null, "compression-min-blob-size": null, "compression-min-blob-size-hdd":
            null, "compression-min-blob-size-ssd": null, "compression-max-blob-size":
            null, "compression-max-blob-size-hdd": null, "compression-max-blob-size-ssd":
            null, "group": null, "max-bytes": null, "max-objects": null, "group-namespace":
            null, "rbd-mirroring-mode": "pool", "weight": 40}], "request-id": "9dd261d4c90d7ba713705ae1b696aecf90f4c7af"}'
          egress-subnets: 10.152.183.182/32
          ingress-address: 10.152.183.182
          private-address: 10.152.183.182
          unit-name: cinder-ceph/0