auth: add display auid to KeyRing::encode_formatted

http://tracker.ceph.com/issues/9790 Fixes: #9790

Signed-off-by: Loic Dachary <loic-201408@dachary.org>
auth: add display auid to KeyServer::encode_secrets

http://tracker.ceph.com/issues/9790 Fixes: #9790

Signed-off-by: Loic Dachary <loic-201408@dachary.org>
auth: unit tests for auid display

Signed-off-by: Loic Dachary <loic-201408@dachary.org>
Merge pull request #2731 from dachary/wip-9790-display-auid

auth: add display of auid to auth get / list when it is not the default

Reviewed-by: Sage Weil <sage@redhat.com>