autotest: fixed copter for new strings for arm/disarm

Tools/autotest/arducopter.py

@@ -35,7 +35,7 @@ def arm_motors(mavproxy, mav):
     wait_mode(mav, 'STABILIZE')
     mavproxy.send('rc 3 1000\n')
     mavproxy.send('rc 4 2000\n')
-    mavproxy.expect('APM: ARMING MOTORS')
+    mavproxy.expect('APM: Arming motors')
     mavproxy.send('rc 4 1500\n')
     mav.motors_armed_wait()
     print("MOTORS ARMED OK")
@@ -48,7 +48,7 @@ def disarm_motors(mavproxy, mav):
     wait_mode(mav, 'STABILIZE')
     mavproxy.send('rc 3 1000\n')
     mavproxy.send('rc 4 1000\n')
-    mavproxy.expect('APM: DISARMING MOTORS')
+    mavproxy.expect('APM: Disarming motors')
     mavproxy.send('rc 4 1500\n')
     mav.motors_disarmed_wait()
     print("MOTORS DISARMED OK")