MINOR: tevt/conn: Report intercepted event for L4 rules

When a L4 rules interrupts the processing, a termination event is reported
for the connection, with the "fd" location.

src/tcp_rules.c

@@ -578,6 +578,8 @@ int tcp_exec_l4_rules(struct session *sess)
 		goto restart;
 	}
  end:
+	if (!result)
+		conn_report_term_evt(conn, tevt_loc_fd, tevt_type_intercepted);
 	return result;
 }