Fixes Error Calling GET on V1 Registry

Calling GET on members in the glance registry no longer returns a
500 Server Error. Since GET isn't supported, it now returns a
405 Method Not Allowed, matching the behavior of members for the
glance api.

Change-Id: I25d7e5f4818a1cdb20788643ae6dd7e277928743
Closes-Bug: #1187395
Merge "Fixes Error Calling GET on V1 Registry"