Update tempest to tag 16.0.0
Update tempest to tag 16.0.0

* It will work with Newton and Ocata releases as well as Pike release.

* https://review.openstack.org/#/c/456837/ release tag-16.0.0

Depends-on: If24608723c220a760ff738db016fe48fbe3c2fbf

Change-Id: I135b599d65ffaa5226f7f5f8589a5344d55462f7

javierpena/rdoinfo,redhat-openstack/rdoinfo