refine tenant api

Signed-off-by: hongming <talonwan@yunify.com>

vendor/gopkg.in/igm/sockjs-go.v2/sockjs/utils.go

@@ -0,0 +1,16 @@
+package sockjs
+
+import "encoding/json"
+
+func quote(in string) string {
+	quoted, _ := json.Marshal(in)
+	return string(quoted)
+}
+
+func transform(values []string, transformFn func(string) string) []string {
+	ret := make([]string, len(values))
+	for i, msg := range values {
+		ret[i] = transformFn(msg)
+	}
+	return ret
+}