Updated hardcoded images during resource class creation

The resource class creation form no longer ignores the image selection.
The list of images is taken from Glance, and the selection is passed on
to tuskar API.

Change-Id: Iec302e0f2a5e05772dfb1a6c0bfe2c4d15744eb5
Closes-bug: #1238060
Closes-bug: #1233087
Merge "Updated hardcoded images during resource class creation"