use catkin_install_python to install python scripts

[mqcmd196]

To fix the error /usr/bin/env: ‘python’: No such file or directory

[k-okada]

  cd /github/home/ros/ws_jsk_common/build/image_view2; catkin build --get-env image_view2 | catkin env -si  /usr/bin/cmake /github/home/ros/ws_jsk_common/src/jsk_common/jsk_ros_patch/image_view2 --no-warn-unused-cli -DCATKIN_DEVEL_PREFIX=/github/home/ros/ws_jsk_common/devel/.private/image_view2 -DCMAKE_INSTALL_PREFIX=/github/home/ros/ws_jsk_common/install; cd -
  
  ...............................................................................
  _______________________________________________________________________________
  Errors << jsk_topic_tools:cmake /github/home/ros/ws_jsk_common/logs/jsk_topic_tools/build.cmake.000.log
  CMake Error at /opt/ros/kinetic/share/catkin/cmake/catkin_install_python.cmake:68 (message):
    catkin_install_python() called with non-existing file
    '/github/home/ros/ws_jsk_common/src/jsk_common/jsk_topic_tools/is_synchronized'.
  Call Stack (most recent call first):
    CMakeLists.txt:248 (catkin_install_python)

[mqcmd196]

@k-okada fixed