Add better status message when adding new monitors
Add better status message when adding new monitors

The `time.sleep(2)` in the `mon_add` method is not enough in some cases.
For example, when a low-spec slow VM acting as a monitor, it may still at
the state of 'probing' after the 2-seconds sleep. But in such cases the
`mon_status` method will just say the monitor *is not running*, it's kind of
confusion.

So maybe it would be better if provides user the current state of the
newly added monitor in the log message.

Signed-off-by: kfei <1da1ad03e627cea4baf20871022464fcc6a4b2c4@kfei.net>

osynge/ceph-deploy,branto1/ceph-deploy,ddiss/ceph-deploy,alfredodeza/ceph-deploy,jumpstarter-io/ceph-deploy,ktdreyer/ceph-deploy,codenrhoden/ceph-deploy,zhouyuan/ceph-deploy,ktdreyer/ceph-deploy,codenrhoden/ceph-deploy,imzhulei/ceph-deploy,rtulke/ceph-deploy,osynge/ceph-deploy,alfredodeza/ceph-deploy,Vicente-Cheng/ceph-deploy,ghxandsky/ceph-deploy,branto1/ceph-deploy,isyippee/ceph-deploy,Vicente-Cheng/ceph-deploy,imzhulei/ceph-deploy,ghxandsky/ceph-deploy,trhoden/ceph-deploy,ceph/ceph-deploy,jumpstarter-io/ceph-deploy,zhouyuan/ceph-deploy,SUSE/ceph-deploy,isyippee/ceph-deploy,rtulke/ceph-deploy,shenhequnying/ceph-deploy,ddiss/ceph-deploy,SUSE/ceph-deploy-to-be-deleted,ceph/ceph-deploy,SUSE/ceph-deploy-to-be-deleted,SUSE/ceph-deploy,shenhequnying/ceph-deploy,trhoden/ceph-deploy