Add internal-network-name networking option

This will help in case of multi-nic k8s node deployments.
Previously, cloud provider was assigning all addresses in random
order and k8s was selecting only one of them. But usually,
multi-nic scenario requires to specify which network is
"control" and admins want to bind kubelet listening address only
to that "control" net.

This commit will not affect previous logic until
internal-network-name is specified in cloud-config file.

Related to: kubernetes#407

Change-Id: I1e4076b853b12020c47529b0590f21523b9d26a8

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