Updated openstack/openstack
Project: openstack/tempest  d93b9401d9332f417e96e6f571a2ca760031f4fc
null
Renew token before expiry time

Modify is_expired so that token is renewed before it
actually expires. The threshold is set to 60s, which is plenty
of time for any API call to complete.
Use utcnow() instead of utc(). Includes unit tests for is_expired.

Closes bug 1292145

Change-Id: Ic062b4352612c936d1f83fcb7cb09154eb628d9e