[Tests] remove a tests that need deprecated sot-dynamic

tests/CMakeLists.txt

 IF(BUILD_PYTHON_INTERFACE)
   ADD_PYTHON_UNIT_TEST("py-import" "tests/test_import.py")
-  ADD_PYTHON_UNIT_TEST("py-joint_state" "tests/test_joint_state.py")
 ENDIF(BUILD_PYTHON_INTERFACE)

tests/test_joint_state.py

-#!/usr/bin/python
-
-try:
-    from dynamic_graph.sot.dynamics.tools import *
-except:
-    print("This test requires sot-dynamic.")
-    exit(42)
-
-from dynamic_graph.ros import RosJointState
-
-rjs = RosJointState('rosjointstate')
-plug(robot.device.state, rjs.state)
-rjs.trigger.recompute(rjs.trigger.time + 1)