Don't create networks if neutron is not enabled

With the composable undercloud installer, it's possible to disable
services.  The extraconfig script assumes both, neutron and nova, are
installed and fails if they aren't.

This patch checks if those services are available before.

Change-Id: Idcc2b9809fcfa92649a0a1f45175ce417dc0e608

extraconfig/post_deploy/undercloud_post.sh

@@ -45,6 +45,7 @@ if ! grep "$(cat /root/.ssh/id_rsa.pub)" /root/.ssh/authorized_keys; then
     cat /root/.ssh/id_rsa.pub >> /root/.ssh/authorized_keys
 fi
 
+if [ "$(hiera neutron_api_enabled)" = "true" ]; then
     PHYSICAL_NETWORK=ctlplane
 
     ctlplane_id=$(openstack network list -f csv -c ID -c Name --quote none | tail -n +2 | grep ctlplane | cut -d, -f1)
@@ -93,9 +94,12 @@ if [ "$net_create" -eq "1" ]; then
             --host-route destination=169.254.169.254/32,gateway=$local_ip \
             $NAMESERVER_ARG ctlplane
     fi
+fi
 
+if [ "$(hiera nova_api_enabled)" = "true" ]; then
     # Disable nova quotas
     openstack quota set --cores -1 --instances -1 --ram -1 $(openstack project show admin | awk '$2=="id" {print $4}')
+fi
 
 # MISTRAL WORKFLOW CONFIGURATION
 if [ "$(hiera mistral_api_enabled)" = "true" ]; then