Add internal-network-name networking option

That will help in case of multi-nic k8s node deployments when
cloud provider was reporting any of node ip addresses instead of
kubelet listening ip address. Now you can specify network where
cloud provider must select ip addresses from.
This will not affect previous logic until admins will not specify
internal-network-name option in cloud-config file.

Related to: kubernetes#407

Change-Id: Ifd576ded28f594f74ab45942a1bed11e223650c7

pkg/cloudprovider/providers/openstack/openstack.go

@@ -125,6 +125,7 @@ type BlockStorageOpts struct {
 type NetworkingOpts struct {
 	IPv6SupportDisabled bool   `gcfg:"ipv6-support-disabled"`
 	PublicNetworkName   string `gcfg:"public-network-name"`
+	InternalNetworkName string `gcfg:"internal-network-name"`
 }
 
 // RouterOpts is used for Neutron routes
@@ -544,7 +545,12 @@ func nodeAddresses(srv *servers.Server, networkingOpts NetworkingOpts) ([]v1.Nod
 			if props.IPType == "floating" || network == networkingOpts.PublicNetworkName {
 				addressType = v1.NodeExternalIP
 			} else {
-				addressType = v1.NodeInternalIP
+				if networkingOpts.InternalNetworkName == "" || network == networkingOpts.InternalNetworkName {
+					addressType = v1.NodeInternalIP
+				} else {
+					klog.V(5).Infof("Node '%s' address '%s' ignored due to 'internal-network-name' option", srv.Name, props.Addr)
+					continue
+				}
 			}
 
 			isIPv6 := net.ParseIP(props.Addr).To4() == nil