Add test of feedback from joint trajectory action

[pazeshun]

This PR adds tests to catch jsk-ros-pkg/jsk_pr2eus#233 (comment) and #1049 (comment).
Travis test of this PR should fail.

[pazeshun]

Travis correctly failed:

<testsuite errors="0" failures="1" name="unittest.suite.TestSuite" tests="4" time="35.169"><testcase classname="__main__.TestPA10Robot" name="test_follow_joint_trajectory_action" time="11.2812"><failure type="AssertionError">0.0 != 2.5 within 1 delta
  File "/usr/lib/python2.7/unittest/case.py", line 329, in run
    testMethod()
  File "/workspace/ros/ws_rtmros_common/src/rtmros_common/hrpsys_ros_bridge/test/test-pa10.py", line 71, in test_follow_joint_trajectory_action
    self.impl_test_joint_trajectory_action(larm, FollowJointTrajectoryGoal())
  File "/workspace/ros/ws_rtmros_common/src/rtmros_common/hrpsys_ros_bridge/test/test-pa10.py", line 111, in impl_test_joint_trajectory_action
    self.assertAlmostEqual(mid_feedback.desired.time_from_start.to_sec(), 2.5, delta=1)
  File "/usr/lib/python2.7/unittest/case.py", line 561, in assertAlmostEqual
    raise self.failureException(msg)

<testsuite errors="0" failures="1" name="unittest.suite.TestSuite" tests="7" time="23.612"><testcase classname="__main__.TestSampleRobot" name="test_follow_joint_angles" time="5.4048"><failure type="AssertionError">0.0 != 2.5 within 1 delta
  File "/usr/lib/python2.7/unittest/case.py", line 329, in run
    testMethod()
  File "/workspace/ros/ws_rtmros_common/src/rtmros_common/hrpsys_ros_bridge/test/test-samplerobot.py", line 173, in test_follow_joint_angles
    self.impl_test_joint_angles(larm, FollowJointTrajectoryGoal())
  File "/workspace/ros/ws_rtmros_common/src/rtmros_common/hrpsys_ros_bridge/test/test-samplerobot.py", line 132, in impl_test_joint_angles
    self.assertAlmostEqual(mid_feedback.desired.time_from_start.to_sec(), 2.5, delta=1)
  File "/usr/lib/python2.7/unittest/case.py", line 561, in assertAlmostEqual
    raise self.failureException(msg)

(from USE_JENKINS=true ROS_DISTRO=kinetic USE_DEB=true)