[Online walking] Remove dx from the test.

Indeed as the simulation may vary in speed, and as the robot is
suppose to move forward, test only if the robot did not fall down
and did not drift too much.

scripts/start_sot_online_walking.py

@@ -26,7 +26,10 @@ class TestSoTTalos(unittest.TestCase):
         f.write("x:"+str(gzGetModelPropResp.pose.position.x)+"\n")
         f.write("y:"+str(gzGetModelPropResp.pose.position.y)+"\n")
         f.write("z:"+str(gzGetModelPropResp.pose.position.z)+"\n")
-        dx=gzGetModelPropResp.pose.position.x-2.1045
+        # dx depends on the timing of the simulation
+        # which can be different from one computer to another.
+        # Therefore check only dy and dz.
+        dx=0.0;
         dy=gzGetModelPropResp.pose.position.y-0.0038
         dz=gzGetModelPropResp.pose.position.z-1.00152
         ldistance = math.sqrt(dx*dx+dy*dy+dz*dz)