Fix django 1.10 tox env

I got carried away and capped the dj110 tox end at <2.0. It should
be capped at <1.11.

Change-Id: I40064b90dc2a340304b6da40f80a6b4e0ffa8a9c

tox.ini

@@ -34,7 +34,7 @@ commands = pip install django>=1.9,<1.10
            python openstack_auth/tests/run_tests.py {posargs}
 
 [testenv:py27dj110]
-commands = pip install django>=1.10,<2.0
+commands = pip install django>=1.10,<1.11
            python openstack_auth/tests/run_tests.py {posargs}
 
 [testenv:pep8]