Updated openstack/openstack
Project: openstack/nova  33a2934244c06c3eeab38f8432c73e77909b942b

Make sure that metadata handler uses constant_time_compare()

This adds a test to ensure that the new behavior of the metadata
API handler persists. It's important that it uses the special
constant_time_compare() method.

Change-Id: I1253661f74dae822be9dc9fe1fdab861ebd64bc9