client: prefer auth cap in caps_issued_mask()
client: prefer auth cap in caps_issued_mask()

If we have an auth cap, prefer to touch that one.  This helps consolidate
caps on a single mds and allows mds replicas to eventually recall their
state.

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

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