Make PHYSICAL_INTERFACE_MAPPINGS variable...

instead of just one provuider interface.
it should contain something like:
physnet2:eth1,physnet3:eth2

roles/nova-compute/templates/nova-compute.service

@@ -26,7 +26,7 @@ ExecStart=/usr/bin/docker run --name %n \
     -e "NOVA_PLACEMENT_USER=placement" \
     -e "NOVA_USER=nova" \
     -e "OS_PASSWORD={{ secrets['OS_PASSWORD'] }}" \
-    -e "PROVIDER_INTERFACE_NAME={{ provider_interface_name }}" \
+    -e "PHYSICAL_INTERFACE_MAPPINGS={{ physical_interface_mappings }}" \
     -e "RABBIT_HOST={{ hostvars[groups['rabbitmq'][0]]['listen_ip'] | default(hostvars[groups['rabbitmq'][0]]['ansible_default_ipv4']['address']) }}" \
     -e "RABBIT_PASSWORD={{ secrets['RABBIT_PASSWORD'] }}" \
     -e "RABBIT_USER=openstack" \