Update TOX_CONSTRAINTS_FILE for stable/xena

Update the URL to the upper-constraints file to point to the redirect
rule on releases.openstack.org so that anyone working on this branch
will switch to the correct upper-constraints list automatically when
the requirements repository branches.

Until the requirements repository has as stable/xena branch, tests will
continue to use the upper-constraints list on master.

Change-Id: I401ef245b18ee99f8ddf00fb2b13562228df309d

1 files changed, 1 insertions, 1 deletions

diff --git a/tox.ini b/tox.ini
index 65779fe..83c6850 100644
--- a/tox.ini
+++ b/tox.ini
@@ -10,7 +10,7 @@ usedevelop = True
 setenv =
    VIRTUAL_ENV={envdir}
 deps =
-       -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
+       -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/xena}
        -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
 commands = stestr run --slowest {posargs}