(multinode) Use network roles for selecting IPs

- With a extensible network configuration, selecting
  the correct IP for a node needs a little more intelligence

Change-Id: I742270a4df440c02bb4bcc03badae3a96e094221

tools/multi_nodes_gate/airship_gate/lib/airship.sh

@@ -15,7 +15,8 @@ install_ingress_ca() {
 
 shipard_cmd_stdout() {
   # needed to reach airship endpoints
-  dns_server=$(config_vm_ip "${BUILD_NAME}")
+  dns_netspec="$(config_netspec_for_role "dns")"
+  dns_server=$(config_vm_net_ip "${BUILD_NAME}" "$dns_netspec")
   install_ingress_ca
   ssh_cmd "${BUILD_NAME}" \
     docker run -t --network=host \
@@ -43,7 +44,8 @@ shipyard_cmd() {
 }
 
 drydock_cmd_stdout() {
-  dns_server=$(config_vm_ip "${BUILD_NAME}")
+  dns_netspec="$(config_netspec_for_role "dns")"
+  dns_server=$(config_vm_net_ip "${BUILD_NAME}" "$dns_netspec")
   install_ingress_ca
   ssh_cmd "${BUILD_NAME}" \
     docker run -t --network=host \

tools/multi_nodes_gate/airship_gate/lib/bgp.sh

@@ -5,7 +5,8 @@ QUAGGA_BGPD_CONF="${TEMP_DIR}/bgpd.conf"
 bgp_router_config() {
   quagga_as_number=$(config_bgp_as "quagga_as")
   calico_as_number=$(config_bgp_as "calico_as")
-  quagga_ip=$(config_vm_ip "build")
+  bgp_net="$(config_netspec_for_role "bgp")"
+  quagga_ip=$(config_vm_net_ip "build" "$bgp_net")
 
   QUAGGA_AS=${quagga_as_number} CALICO_AS=${calico_as_number} QUAGGA_IP=${quagga_ip} envsubst '${QUAGGA_AS} ${CALICO_AS} ${QUAGGA_IP}' < "${TEMPLATE_DIR}/bgpd_conf.sub" > "${QUAGGA_BGPD_CONF}"
 

tools/multi_nodes_gate/airship_gate/lib/ssh.sh

@@ -24,10 +24,11 @@ ssh_config_declare() {
       envsubst < "${TEMPLATE_DIR}/ssh-config-global.sub" > "${SSH_CONFIG_DIR}/config"
     for n in $(config_vm_names)
     do
+      ssh_net="$(config_netspec_for_role "ssh")"
       env -i \
         "SSH_CONFIG_DIR=${SSH_CONFIG_DIR}" \
         "SSH_NODE_HOSTNAME=${n}" \
-        "SSH_NODE_IP=$(config_vm_ip ${n})" \
+        "SSH_NODE_IP=$(config_vm_net_ip ${n} "$ssh_net")" \
           envsubst < "${TEMPLATE_DIR}/ssh-config-node.sub" >> "${SSH_CONFIG_DIR}/config"
       if [[ "$(config_vm_bootstrap ${n})" == "true" ]]
       then