Refactoring for the list images tests

* Replaced assertTrue's with assertIn/assertNotIn
* Fixed pep8 issues
* Removed detailed messages for assertIn/NotIn as
  these assertions provide very detailed output

Change-Id: I04173181e7e3773392aa16b021a2febd587aebd3
Added error checking for auth in Compute fixture

* Now verifies that the authentication request was
  successful before using auth data

Change-Id: I683b2f9727e2b176977e531d696e7488da1d6e78
Correct checked error for rebuilding locked server

* Modifies the expected error when attempting to
  rebuild a locked server to 409

Change-Id: I3d9b95aea82be8b7a1355cfa2ef0fe6c4abf4c08
Merge "Refactoring for the list images tests"
pep8/pyflakes fixes for compute servers tests

* Shortened variable names/comments to fit character limit
* Modified comments to use correct style
* Reformatted code to fit pep8 and internal code standards

Change-Id: I34b41bd26ff002998d118f2f68b5f6235ef8f9fd
Updating secrets tests for mime-type revamp

Change-Id: Iff017dceec61ed0f9e0e3a76f040fb845be0aef4
Merge "Added error checking for auth in Compute fixture"
Merge "Correct checked error for rebuilding locked server"
Merge "pep8/pyflakes fixes for compute servers tests"
Updating barbican orders tests for mime type revamp

Change-Id: I52ca84c898b884615dfb779bebf1893e959ba034
Merge "Updating barbican orders tests for mime type revamp"
Refactoring secrets tests to use data driven tests

Change-Id: Ia9da1096ff45b85b73118c4a8fa3cb456d454bfc
Fix outdated import

The package cloudcafe.images.v2_0 has been changed to
cloudcafe.images.v2 but some import statements don't reflect this.

Change-Id: I26e1669673f118deb9f593cffe99cd1a80fb64f6
Refactoring orders tests to use data driven tests

Change-Id: Ia9d8631ae385d763f277dc669eea58f096311d62
Merge "Fix outdated import"