client: fix mds routing for link requests
client: fix mds routing for link requests

We want to send link requests to the auth for the new name, not the
target inode.  We also want to drop FILE_SHARED caps on new name's
directory.

Signed-off-by: Sage Weil <c5b6ff1fd4f0bde10db63d7a3e07166cf6c4229f@dreamhost.com>

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