nova unit test virtual environment creation issue

[naggappan]

I tried to run nova unit test in Read Hat virtual machine
Linux rhel6-madhu 2.6.32-431.20.3.el6.x86_64 #1 SMP Fri Jun 6 18:30:54 EDT 2014 x86_64 x86_64 x86_64 GNU/Linux

cd /etc/nova/
./run_tests.sh -V nova.tests.scheduler

I am getting the error while when the run test creates .venv and tries trying to upgrade glance when installing

pip install cryptography.

I even tried to install manually "pip install cryptography" in read hat and gave the same error .
Error pasted here : http://pastebin.com/tAsSRFuA

I made sure the following are done ,

yum upgrade
yum install gcc libffi-devel python-devel openssl-devel

This issue happens only in readhat . I tried in Centos 6.5 and it works fine. Any help to fix this issue would be appreciable .

Note: This issue is reproducible when you tried to do it in any Readhat.

[Joe Gordon (jogo)]

Have you followed the directions at:

http://docs.openstack.org/developer/nova/devref/development.environment.html

sudo yum install python-devel openssl-devel python-pip git gcc libxslt-devel mysql-devel postgresql-devel libffi-devel
sudo pip-python install tox