Update provider networks plugin to support multiple network mappings
Update provider networks plugin to support multiple network mappings

This patch updates the provider networks plugin by adding support
for network interface to bridge mappings. For each flat/vlan provider
network, a network_interface can be defined that will be added to an OVS
provider bridge automatically. This supercedes the network_interface override
for OVS-based deployments, including OVS, OVS w/ DVR, and OVN, that was
only available outside of the plugin.

Change-Id: I99d95ab103f9d64726a809eb81db69e0b2b18ffb

openstack/openstack-ansible-plugins,openstack/openstack-ansible-plugins