Update behaviors with tasks methods

*Added create_new_task method to images behaviors
*Added create_new_tasks method to images behaviors
*Added list_tasks_pagination method to images behaviors
*Added validate_task method to images behaviors
*Added wait_for_task_status method to images behaviors

Change-Id: I8edabf5d759bef1be471fc6ff371f929ec4da8ec
Merge "Update behaviors with tasks methods"