Updated openstack/openstack
Project: openstack/cinder  2f76ac95d944f1f3c7a8eeb2376e0825af389b06

fix a small typo in development.environment.rst

virutalenv ==> virtualenv

Change-Id: If090ab7b92230fba15d7be98a84b51cce507bedd
Closes-bug: 1358531