Add images composite. change glance references

* changed glance reference to images
* added the images composite
* changed user names in the config and composite

Change-Id: I679613f0c2af28c80c169dad1cc33ec567ec0ed4
Adding require extension for check before executing certain test

* Added list extension client, model and composite
* renamed ExtensionList to Extension
* Fixed pep8 issues

Change-Id: I32eaeb23bf13645a4349ed06c308b4c3f366d479
Merge "Adding require extension for check before executing certain test"
ObjectStorage Create SLO Behavior

* Added new behavior to allow creation of
  SLO based on either a manifest or a list
  of info to create segment objects.

Change-Id: I638c9b5df14dd8ae30bf2c6a999c81af7d34b6af
Fixed wrong import convention

Change-Id: I0e5d6ea958e2f69dc74dc06cf0ad1319c58d1c06
Merge "ObjectStorage Create SLO Behavior"