Comment 2 for bug 1841176

This appears to be fixed by the following commit:

commit 872c670ed6367ff575262f9284273ff60bffd6b7
Author: James Page <email address hidden>
Date: Thu May 30 16:48:17 2019 +0100

    Add support for Nautilus release

    Resync charms.ceph to pickup changes to support new approach to
    admin and bootstrap key generation with in the ceph-mon cluster.

    Update get_mon_hosts to avoid specifying the port number for the
    MON daemons; we use the default so this is not required, and at
    Nautilus the MON daemons run both v1 and v2 messenger ports.

    Specifying the port in the ceph.conf file disables the v2
    messenger port which is not the desired behaviour on upgrade
    or new installation.

    Drop start hook; this has been present in the charm since its
    inception as 'ceph' but is really not needed - re-deploying the
    charm to units which previous hosted ceph-mon is dangerous
    and the ceph-* daemons should still be running anyway.

    Depends-On: I2dfab7404b72e314625ea554ee64595c5e26f3c6
    Change-Id: I340dbf427551e6f9f8cd4ca89128627e497d6097