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: I200e0fa268c4357403ca6c158fbbe682080c13d1
Closes-Bug: #1313119
Improve conductor error cases when unshelving

This commit handles different cases when the key 'shelved_image_id'
is not defined or None. Also it tries to improve the error messages.

Closes-Bug: #1307416
Change-Id: Ia2d0a183eefccdfd6f612d86f60cd2930c1a4b23
Merge "Improve conductor error cases when unshelving"
Merge "Fix broken version responses"