Images API v2.0 Force User To See My Images

Implements 'force a user to see my images' test:
 - added a new test scenario - force a user to see my images.
 - refactored image fixtures.
 - reverted changes made on the image fixtures and made it a separate PR.
 - improved naming of variables.

Refactors the test to add tags.

Change-Id: I414c3a922346e86693fb2883ef5180aa7334472f
Subject: Pep8 fix

* fixed some visual indents in the object smoke test

Change-Id: I94d487a095636f7942f5e3e63fa0d11ddff0b5e1
Merge "Images API v2.0 Force User To See My Images"
Merge "Subject: Pep8 fix"