Do not isolate networks for baremetal

Network isolaton is not currently a supported feature for baremetal
deployments.  This adjusts the isolated credentials to avoid creation of
isolated network environments for created tenants.  Instead, we rely on
a shared private network serving addresses from a common subnet.

Change-Id: I34b16ed5a6f9221707f3a9d0d4619bb3b261e14f
Merge "Do not isolate networks for baremetal"