cephadm:Add a daemon mode for cephadm to provide a metadata endpoint
Reviewed-by: Ernesto Puerta <epuertat@redhat.com> Reviewed-by: Jan Fajerski <jfajerski@suse.com> Reviewed-by: Juan Miguel Olmo Martínez <jolmomar@redhat.com> Reviewed-by: Sebastian Wagner <sebastian.wagner@suse.com> Reviewed-by: Stephan Müller <smueller@suse.com>