Fix broken version responses

The version responses link to non-existing PDF and WADL files.
Remove the WADL link and replace the PDF link with a HTML link to
docs.openstack.org.

Change-Id: Id514caee32df430b616609144f52d1a58c93d9cd
Closes-Bug: #1313118
Closes-Bug: #1313116
Merge "Fix broken version responses"