Updated openstack/openstack
Project: openstack/python-openstackclient  5c8b43e891658b276b0f6a803fddc2fa8f1accc6

Remove duplicate env function in shell.py

There already exists an env() function in utils. Let's use that
one since it's common.

Change-Id: I661984394cf0c0543b2f35bf76e3929dead54d1d