Use os-net-config in multinode jobs

Full credits to James Slagle, author of this code in TripleO CI:
https://review.openstack.org/#/c/409346

This patch adds a new template for configuring networking on the
Overcloud nodes using os-net-config in multinode jobs. Previously we
were not using os-net-config at all.

Also updates the multinode.yaml environment to use this network config
template.

The IP of each subnode is used when the vxlan tunnels are configured in
OVS, given that, each node needs its own unique network configuration.
To accomodate that, the templates makes use of the network_config_hook
function to influence run-os-net-config.sh

This patch is just the first step to totally switching to os-net-config
in multinode jobs. The devstack-gate code is still in use to bootstrap
the initial networking on the undercloud and subnodes. That will be
switched over in subsequent patches.

Change-Id: I6efa71eb23109d0b3b480061135c572ab89f5981
Co-Authorized-By: James Slagle <jslagle@redhat.com>
Implements: blueprint multinode-ci-os-net-config

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