mon/MonClient: ensure !cur_con == cur_mon.empty()

Keep these in sync.

Signed-off-by: Sage Weil <sage@redhat.com>
librados: shut down monclient after objecter

The objecter ms_handle_reset may call into monc; shut objecter down first.

Fixes: #9130
Signed-off-by: Sage Weil <sage@redhat.com>
osdc/Objecter: handle MStatfsReply exclusively

Client doesn't need this.

Signed-off-by: Sage Weil <sage@redhat.com>