Add OpenStack Infrastructure users.

This will permit OpenStack infra to run CI (and related) workloads in
cd-overcloud.tripleo.org.

Change-Id: I773852bb3ea3e3d8db9071525b384bcefc19e692
Separate out metadata and default routes.

With the host routes extension we can access the metadata service
without having to mess about with the default route, increasing
performance. Yay. Only works for single L2 networks (because any
router seeing traffic for 169.254.169.254 will discard it unless
explicitly configured. Configuring that is a use case for neutron
baremetal...

Related-Bug: #1239481
Change-Id: If434cc2e71ec9ee71c6e75b5aa4eff0a351d107b
Merge "Add OpenStack Infrastructure users."
Merge "Separate out metadata and default routes."