replay: use lockstep scheduler

ROMFS/px4fmu_common/init.d-posix/rc.replay

@@ -16,5 +16,4 @@ param set SDLOG_DIRS_MAX 7
 replay tryapplyparams
 ekf2 start -r
 logger start -f -t -b 1000 -p vehicle_attitude
-sleep 0.2
 replay start

ROMFS/px4fmu_common/init.d-posix/rcS

@@ -240,8 +240,11 @@ then
 fi
 
 dataman start
-replay tryapplyparams
-simulator start -c $simulator_tcp_port
+# only start the simulator if not in replay mode, as both control the lockstep time
+if ! replay tryapplyparams
+then
+	simulator start -c $simulator_tcp_port
+fi
 tone_alarm start
 rc_update start
 sensors start