* Fix networking so that we can extend it for MR swift gate.
* Add a vars file for region A and region B.
* Add host_vars and inventory files for region A and region B
* Split out the function-test to allow all scenarios to use the same
test.yml file.
* Use -e @vars-file.yml format in tox.ini since we can't include vars
files based on a variable.
* Remove any references to include_vars: test-vars.yml as a result of
moving to use -e @vars-file.yml
* Add static routes into host_vars for swift-proxy and swift-storage
hosts so that they can route to the other region.
* Make addresses in test-vars more generic based on inventory.
Change-Id: I52b4068acbc80dcb7710d388ccbed2edcb8bfd61
80d2d96a5f