qshell: rename qshell sequence fields so they can be parsed on fastrtpsgen

msg/qshell_req.msg

@@ -2,4 +2,4 @@ uint64 timestamp		# time since system start (microseconds)
 char[100] cmd
 uint32 MAX_STRLEN = 100
 uint32 strlen
-uint32 sequence
+uint32 request_sequence

msg/qshell_retval.msg

@@ -1,3 +1,3 @@
 uint64 timestamp		# time since system start (microseconds)
 int32 return_value
-uint32 sequence
+uint32 return_sequence

src/drivers/qshell/posix/qshell.cpp

@@ -101,7 +101,7 @@ int QShell::_send_cmd(std::vector<std::string> &argList)
 
 	qshell_req.strlen = cmd.size();
 	strcpy((char *)qshell_req.cmd, cmd.c_str());
-	qshell_req.sequence = _current_sequence;
+	qshell_req.request_sequence = _current_sequence;
 
 	int instance;
 	orb_publish_auto(ORB_ID(qshell_req), &_pub_qshell_req, &qshell_req, &instance, ORB_PRIO_DEFAULT);
@@ -131,7 +131,7 @@ int QShell::_wait_for_retval()
 			struct qshell_retval_s retval;
 			orb_copy(ORB_ID(qshell_retval), _sub_qshell_retval, &retval);
 
-			if (retval.sequence != _current_sequence) {
+			if (retval.return_sequence != _current_sequence) {
 				PX4_WARN("Ignoring return value with wrong sequence");
 
 			} else {

src/drivers/qshell/qurt/qshell.cpp

@@ -116,7 +116,7 @@ int QShell::main()
 
 			struct qshell_retval_s retval;
 			retval.return_value = run_cmd(appargs);
-			retval.sequence = m_qshell_req.sequence;
+			retval.return_sequence = m_qshell_req.request_sequence;
 
 			if (retval.return_value) {
 				PX4_ERR("Failed to execute command: %s", m_qshell_req.cmd);