tree bde07561f43eb21795df8bcab4a9672eac3cdda3
parent 82938473afcf9ab8fa018e9e0cc7d0821dbd6a1b
author James E. Blair <jeblair@linux.vnet.ibm.com> 1454538725 -0800
committer James E. Blair <jeblair@linux.vnet.ibm.com> 1454541634 -0800

Pass ZUUL_TEST_ROOT through tox

This is so that one might, for example, run the zuul tests out of
a tmpfs.

Change-Id: I8e1d5b11c83e5f782f92d95b0d09632312bf310d