Add test cases for session manager (session state machine)

src/session/session_private.h

@@ -22,16 +22,15 @@ enum tcp_ex_data
     // HANDSHAKE
     TCP_SYN_RECVED = 1 << 0,
     TCP_SYNACK_RECVED = 1 << 1,
-    TCP_ACK_RECVED = 1 << 2,
     // ESTABLISHED
-    TCP_C2S_PAYLOAD_RECVED = 1 << 3,
-    TCP_S2C_PAYLOAD_RECVED = 1 << 4,
+    TCP_C2S_PAYLOAD_RECVED = 1 << 2,
+    TCP_S2C_PAYLOAD_RECVED = 1 << 3,
     // FIN
-    TCP_C2S_FIN_RECVED = 1 << 5,
-    TCP_S2C_FIN_RECVED = 1 << 6,
+    TCP_C2S_FIN_RECVED = 1 << 4,
+    TCP_S2C_FIN_RECVED = 1 << 5,
     // RST
-    TCP_C2S_RST_RECVED = 1 << 7,
-    TCP_S2C_RST_RECVED = 1 << 8,
+    TCP_C2S_RST_RECVED = 1 << 6,
+    TCP_S2C_RST_RECVED = 1 << 7,
 };
 
 enum udp_ex_data