There is a shared caching infrastructure in ansible now for inventory
and fact plugins. It needs to be configured so that our inventory access
isn't slow as dirt.
Unfortunately the copy of openstack.py in 2.6 is busted WRT to caching
because the internal API changed ... and we didn't have any test jobs
set up for it. This also includes a fixed copy of the plugin and
installs it into the a plugin dir.
Change-Id: Ie92e5d7eac4b7e4060a4e07cb29c5a6f2a16ae18