Fix OpenStack images pagination

Pagination is always forced by Glance conf file. So we
need to always obtain all pages of images in cycle.

Depends-On: https://github.com/fog/fog/pull/3321
Depends-On: https://github.com/fog/fog/pull/3322

https://bugzilla.redhat.com/show_bug.cgi?id=1164764
Merge pull request #1198 from Ladas/openstack_fix_images_pagination

Fix OpenStack images pagination