Merge pull request #1260 from RichardScothern/registry-2.2.1

Registry 2.2.1

library/registry

@@ -7,6 +7,6 @@ latest: git://github.com/docker/[email protected]
 0.8.1: git://github.com/docker/[email protected]
 0.9.1: git://github.com/docker/[email protected]
 
-2: git://github.com/docker/distribution-library-image@af287a2a6379ac099edc9c76672abe5cbe2f9469
-2.2: git://github.com/docker/distribution-library-image@af287a2a6379ac099edc9c76672abe5cbe2f9469
-2.2.0: git://github.com/docker/distribution-library-image@af287a2a6379ac099edc9c76672abe5cbe2f9469
+2: git://github.com/docker/distribution-library-image@3aadce6abde20374ff286d444b24a0ac8949ba65
+2.2: git://github.com/docker/distribution-library-image@3aadce6abde20374ff286d444b24a0ac8949ba65
+2.2.1: git://github.com/docker/distribution-library-image@3aadce6abde20374ff286d444b24a0ac8949ba65