Ceph » mgr » Dashboard

1. A cephadm option to not set the grafana url, so we can avoid making the problem worse, and allow the user to set the dashboard setting themselves.
2. A per-host fqdn property (along-side addr and name). This way dashboard configuration will update if grafana gets moved. Downside is that maybe there is a cert to use that doesn't match the host fqdn.
3. ?

https://github.com/ceph/ceph/blob/3f7b7b658b642f0976a4de0f1d40633fac1c86ce/src/pybind/mgr/cephadm/module.py#L250-L255

Set `config_dashboard` option to False and cephadm won't manage the Dashboard options.