Add image discovery of images available to user b test

*Added test_image_discovery_of_images_available_to_user_b test
*Updated test module name, class name, and test name

Change-Id: Id2cf8bf55adb070c90659391cf3ae013e28249d4
Add get tasks, share imported image, and task states tests

*Added get_tasks and get_tasks_filter_type tests
*Added share_imported_image test
*Added import_task_states test
*Removed extra blank lines

Change-Id: I1dc519e24b7f31de83d2d747aa9c25328b85768a
Add create_import_task test

*Added create_import_task test
*Updated test steps, removed some duplicate validations
*Made use of the generic validate_task method
*Updated offset variables with delta variable names

Change-Id: I1655acbf668c4c7f49dff89346a5569ec78c38c4
Add get task schemas and get task tests

*Added get_task_schema test
*Added get_tasks_schema test
*Added get_task test
*Added get_task_not_owned_by_tenant test
*Removed extra blank lines
*Updated _validate_get_task_response method name
*Removed test tag
*Updated correct method call in get_task test

Change-Id: I1c4d6a95464fdd5af6b3dd0076f473b78da6e196
Merge "Add image discovery of images available to user b test"
Merge "Add get task schemas and get task tests"
Merge "Add get tasks, share imported image, and task states tests"
Merge "Add create_import_task test"