Ignore built files.

We don't want someone accidentally committing them.

Change-Id: Iec4df61d3b7b1e1bd30f4cbba6b9991062758101
Remove unused network configuration metadata.

This is supplied to neutron etc via API calls - having it in Heat
leads to having redundancy, confusion and tricky scripts. Incubator
now has scripts to configure this and instances won't consult these
keys.

Change-Id: Ia45d9bf5bb326ec88f9f4a48c5520570cf5b6d72
Set a physical bridge for network nodes.

The overcloud control plane needs to bring up an ovs bridge for the
ovs plugin hot-plugging and floating ip logic to work. The previous
in-instance script didn't migrate IP address and route information. We
can do that by using the core ovs script we wrote for baremetal setups
- triggered by setting the physical interface parameter.

Change-Id: I6d6b09140ee751371607c0963dc76cc5b95f7674
Add ability to set overcloud hypervisor type.

This is needed for non-nested-kvm capable environments.

Change-Id: I2b87071941c04d3c99a687082db42d2a84f481fd