Use correct region value
Use correct region value

TripleO is using 'regionOne' instead of default 'RegionOne',
so we need to override the default in config file.

Change-Id: I7c16bbed9b86ee3331aa9f7fea1a0cf6c80b9ca8
Closes-Bug: rhbz#1357579

openstack/python-tripleoclient