Updated openstack/openstack
Project: openstack/keystone  e4784887e59cb1472491210194cb40910f87dc4b

Make the mutable default arg check very strict

Previously we were only checking for mutable literals. This adds checks
for any callable, which would include dict(), list(), etc.

Change-Id: I12e09f53cd00139549354906f3f4c08f689ff3e2