Fixes <xi:include> and removes <xi:fallback>

Changes the location point <xi:include> to git.openstack.org
as it is a more reliable source for OpenStack projects.

Partial-Bug: #1338678

Change-Id: I72ea09050da643b6dee45a679caa3fcc0bd31172
Merge "Fixes <xi:include> and removes <xi:fallback>"