Commit test list join for availability_zone

These changes were imported from upstream @ commit
	e38076e29ef8c86c510fca3141954d10602040bb
- Updated `nested_iterables` to parse list_join if available in
	 the templates
- Updated `test_volume_resource_ids` to allow volume ids
	to be provided as a parameter list
- Appropriate fixture additions and changes

Change-Id: Ia2187fe4eb7a389c8df01061be229246262d9a24
Issue-Id: VVP-29
Signed-off-by: Edan Binshtok <eb578m@intl.att.com>