Updated openstack/openstack
Project: openstack/oslo-incubator  053adbee13d3ace3085df1d1fd15d696463a60e2

use /usr/bin/env python instead of /usr/bin/python

The usage of /usr/bin/env ensures that the first interpreter
found in the environment's $PATH variable is used.

Change-Id: Id2e500721084ccaeb86532263d278cb4d5ce0d4d