Third-party testing document updates.

Change-Id: Idccf0b09008483b407b574dadce67845aed7daf0
Reviewed-on: https://review.openstack.org/26224
Reviewed-by: James E. Blair <corvus@inaugust.com>
Approved: Clark Boylan <clark.boylan@gmail.com>
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Tested-by: Jenkins