Fix version links to docs.openstack.org

Remove PDF link.
Replace deep html links with links to the docs.openstack.org site.

Change-Id: Ic7c2218bf43a221e8d753a910fdfb2243851214d
Closes-Bug: #1313127
Reduce log noise on expired tokens

If a token has expired, we now check the username field exists before
trying to len() it, thus reducing log noise.

Change-Id: Ie463607e4fb7ca671f9dad5559b87fe7721be4bd
Closes-Bug: #1319997
Merge "Fix version links to docs.openstack.org"
Merge "Reduce log noise on expired tokens"