Recently merged commit I5bbdc0f97db9b0ebd7b48e50ab7869e2ca33aead got in
a dependency on Jinja2 library without adding it to requirements.txt.
The gate was running fine, because Nova already has it in it's
requirements. Problem uncovers when we install DevStack with
--use-venv=True option.
Change-Id: If053c4724d9d0264e0f3b27a995a2b619cf6f515
Closes-Bug:
1466361
eventlet>=0.17.3
greenlet>=0.3.2
iso8601>=0.1.9
+Jinja2>=2.6
keystonemiddleware>=1.5.0
kombu>=3.0.7
lxml>=2.3