Updated openstack/openstack
Project: openstack/requirements  a4006aab8e1276851faaf5f70f4bd57080eabceb

Revert "Exclude testtools 1.4.0"

This reverts commit b673b16ac572719cd8552c9cd05448409b628b28.

Change-Id: I0a142b3cbafa2af8b85a2f766c661ce3b69812b0