Added SESSION_FORWARD_TYPE enum to define the type of session forwarding

lib/MySQL_Thread.cpp

@@ -3872,7 +3872,7 @@ void MySQL_Thread::ProcessAllSessions_Healthy0(MySQL_Session *sess, unsigned int
 	char _buf[1024];
 	if (sess->client_myds) {
 		if (mysql_thread___log_unhealthy_connections) {
-			if (sess->session_fast_forward == false) {
+			if (sess->session_fast_forward == SESSION_FORWARD_TYPE_NONE) {
 				proxy_warning(
 					"Closing unhealthy client connection %s:%d\n", sess->client_myds->addr.addr,
 					sess->client_myds->addr.port

lib/PgSQL_Data_Stream.cpp

@@ -1244,7 +1244,7 @@ void PgSQL_Data_Stream::reset_connection() {
 			myconn->last_time_used = sess->thread->curtime;
 			return_MySQL_Connection_To_Pool();
 		} else {
-			if (sess && sess->session_fast_forward == false) {
+			if (sess && sess->session_fast_forward == SESSION_FORWARD_TYPE_NONE) {
 				destroy_MySQL_Connection_From_Pool(true);
 			} else {
 				destroy_MySQL_Connection_From_Pool(false);