Minor fixes in boot from volume tests

    * Fix PEP8 issues
    * Adding CBS calls for better validaion around auto delete
    * Fixing rebuild tests - because of disk size diferent calculation
    * Rescue not allowed on boot from volume skipping
    * Resize fixes and cleaning
    * timeout added for volume creation

Change-Id: I71807f6fb67e659cd9232c58d72d778cf1596021
Merge "Minor fixes in boot from volume tests"