Avoid NodeNetworkUnavailable condition check for every node status update

- We know that kubelet sets NodeNetworkUnavailable condition when the node is
created/registered with api server.
- So we only need to call clearInitialNodeNetworkUnavailableCondition()
for the first time and not during subsequent node status update events.

Author: Ravi Sankar Penta

pkg/network/master/subnets.go

@@ -247,14 +247,15 @@ func (master *OsdnMaster) handleAddOrUpdateNode(obj, _ interface{}, eventType wa
 		utilruntime.HandleError(fmt.Errorf("Node IP is not set for node %s, skipping %s event, node: %v", node.Name, eventType, node))
 		return
 	}
-	master.clearInitialNodeNetworkUnavailableCondition(node)
 
 	if oldNodeIP, ok := master.hostSubnetNodeIPs[node.UID]; ok && (nodeIP == oldNodeIP) {
 		return
 	}
 	// Node status is frequently updated by kubelet, so log only if the above condition is not met
 	glog.V(5).Infof("Watch %s event for Node %q", eventType, node.Name)
 
+	master.clearInitialNodeNetworkUnavailableCondition(node)
+
 	usedNodeIP, err := master.addNode(node.Name, string(node.UID), nodeIP, nil)
 	if err != nil {
 		utilruntime.HandleError(fmt.Errorf("Error creating subnet for node %s, ip %s: %v", node.Name, nodeIP, err))