mon: do not put() unhandle message

If we return false because we aren't handling a message, we should not put
the ref.  This fixes a double-free.

Signed-off-by: Sage Weil <sage@inktank.com>
mon: allow MMonGetMap without authentication

This is used by the MonClient::get_monmap_privately() helper.

Signed-off-by: Sage Weil <sage@inktank.com>
Merge pull request #695 from ceph/wip-mon-auth

fix mon double-free when dropping unhandled messages, and allow "get monmap" messages to go through without authenticating for MonCliente::get_monmap_privately()

Reviewed-by: Joao Eduardo Luis <joao.luis@inktank.com>