New client for RHEL activation

* Client returns boolean depending of if RHEL activation passed or failed
* Added new behaviour that gets the image ids based on key string
* Changed image name to search name
* Renaming behaviour with removing group from it
* Fixing typo pep8 issues
* Entity responce check added
* Moving to single list creation

Change-Id: I719e83745d46a7402f7429e1ed3f136d41c883b4
Merge "New client for RHEL activation"