mon: fix 'ceph mds fail <N>' command
mon: fix 'ceph mds fail <N>' command

We need to remove the mds_info from the map for cmds to take notice.

Fixes: #720
Signed-off-by: Sage Weil <6dd34506bbd5e58221bbb3e4732d97c91f02277b@newdream.net>

ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph