[Python] remove rospkg

rospkg was used to find a path to the current directory. This was
updated in the previous commit, so now rospkg is useless.

scripts/test_kine.py

 #! /usr/bin/env python
 import sys
 import rospy
-import rospkg
 import time
 from os.path import abspath, dirname, join
 
@@ -42,12 +41,7 @@ def runTest():
         runCommandStartDynamicGraph = rospy.ServiceProxy('start_dynamic_graph',
                                                          Empty)
 
-        # get an instance of RosPack with the default search paths
-        rospack = rospkg.RosPack()
-
         # get the file path for rospy_tutorials
-        lpath = rospack.get_path(PKG_NAME)
-        print(lpath)
         initCode = open(join(dirname(abspath(__file__)), 'appli.py'), "r").read().split("\n")
 
         rospy.loginfo("Stack of Tasks launched")

scripts/test_sot_talos_balance.py

 #! /usr/bin/env python
 import sys
 import rospy
-import rospkg
 import time
 import unittest
 import math
@@ -18,12 +17,7 @@ PKG_NAME='talos_integration_tests'
 from sot_talos_balance.utils.run_test_utils import  \
     run_ft_calibration, run_test, runCommandClient
 
-# get an instance of RosPack with the default search paths
-rospack = rospkg.RosPack()
-
 # get the file path for rospy_tutorials
-lpath = rospack.get_path(PKG_NAME)
-print(lpath)
 appli_file_name = join(dirname(abspath(__file__)), 'appli_dcmZmpControl_file.py')
 
 time.sleep(2)