refine tenant api

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

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

@@ -0,0 +1,13 @@
+package sockjs
+
+// Session represents a connection between server and client.
+type Session interface {
+	// Id returns a session id
+	ID() string
+	// Recv reads one text frame from session
+	Recv() (string, error)
+	// Send sends one text frame to session
+	Send(string) error
+	// Close closes the session with provided code and reason.
+	Close(status uint32, reason string) error
+}