Remove alt_url from images fixture

-Removed alt_url references from images fixture
-Updated servers behavior arguments

Change-Id: I5b17f8f3405c7e9a45e1cb0a652dbbadb94ae25d
Fix broken smoke tests

-Updated test_create_export_task
*Moved create_image_via_task method call to setup class
-Updated test_delete_image
*Updated setup class to use create_image_via_task
-Updated test_update_image
*Removed smoke tag
*Updated setup calss to use create_new_image
*Removed visibility references

Change-Id: Ibc87c7eb3681a7aaaef5f4269bbb118058cdf27c
Breaking down the test fixtures into reusable parts

    * VNC console and Change Password
    * Actions test cases de-composited in order to be reusable by boot from volume tests
    * Fixed PEP8 issues
    * Renaming Plugin to Base Fixture after Daryl review
    * Fixed naming of the resize down confirm abse fixture
    * Chris triple inheritance proposal implemented

Change-Id: I9681db8477d6a5853f0c21e31f7c8a10a0ac6bc2
Merge "Remove alt_url from images fixture"
Merge "Breaking down the test fixtures into reusable parts"