monclient: fix locking
monclient: fix locking

Hold lock in handle_* methods; assert lock held in all _* methods.

Fixes: #731
Signed-off-by: Sage Weil <6dd34506bbd5e58221bbb3e4732d97c91f02277b@newdream.net>

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