Fix bad check for openstack versions (vendor_data/config drive)

Looks like the lack of a test case sneaked in this bug. Added a
simple one that just ensures that we can get a list of all the
metadata information. Basic issue was that the check_version
was checking against ec2 versions. Changed it to check OpenStack
version including the 'latest'.

Fixes bug #1211122

Change-Id: Ifac7659467b81abcffd3f84a24292c11f2e058fc
Merge "Fix bad check for openstack versions (vendor_data/config drive)"