mon: add 'ceph osd rm N...' command
mon: add 'ceph osd rm N...' command

So we can mark an old osd as deleted and have it not appear in the osdmap
dump, summary count.

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

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