mds: fix resolve
mds: fix resolve

This was broken by a01fba175b646f6 when an ambiguous import was changed
from CDIR_AUTH_UNKNOWN to <whoami,whoami> and disambiguate_imports wasn't
updated accordingly.  The result was inconsistent results for subtree
ownership on different nodes.

This updates disambiguate_imports to match that EImportStart::replay
change.

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

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