[AliCloud] Add cluster name and bug fix (#412)

* [AliCloud] add tag ClusterName for different k8s cluster

* [AliCloud] BugFix: vk get wrong pod ip

* update serverless kubernetes help doc link

providers/alicloud/config.go

@@ -15,6 +15,7 @@ type providerConfig struct {
 	Pods            string
 	VSwitch         string
 	SecureGroup     string
+	ClusterName     string
 }
 
 func (p *ECIProvider) loadConfig(r io.Reader) error {
@@ -47,5 +48,9 @@ func (p *ECIProvider) loadConfig(r io.Reader) error {
 	if p.operatingSystem == "" {
 		p.operatingSystem = providers.OperatingSystemLinux
 	}
+	p.clusterName = config.ClusterName
+	if p.clusterName == "" {
+		p.clusterName = "default"
+	}
 	return nil
 }