Updated openstack/openstack
Project: openstack/python-troveclient  fa3e560f8ec009558a0cb7ac2523ab9803a2ec56

Fixed typo in doc/source

There was a typo in the Authentication section of the usage.rst
file.

This has been fixed, along with some lining up of comments in the
test code to make it easier to read.

Change-Id: I342a286055246beaeadc7e763d3b75bd17c32a60