[unittest] Sorting modules

unittest/test_all.py

-import unittest
 import sys
+import unittest
 
 testmodules = [
     'test_load',

unittest/test_load.py

-from unittest_utils import loadTalosArm, loadTalos, loadHyQ
 import unittest
+from unittest_utils import loadHyQ, loadTalos, loadTalosArm
 
 
 class RobotTestCase(unittest.TestCase):

unittest/unittest_utils.py

+import numpy as np
 import pinocchio
 from pinocchio.robot_wrapper import RobotWrapper
-import numpy as np
 
 
 def readParamsFromSrdf(robot, SRDF_PATH, verbose):