cleaning up recipes-devtools/python recipes

recipes-devtools/python/python-catkin-pkg_0.1.16.bb

recipes-devtools/python/python-empy_3.3.bb

recipes-devtools/python/python-pyyaml_3.10.bb

recipes-devtools/python/python-rosinstall_0.6.21.bb

recipes-devtools/python/python-rospkg_1.0.15.bb

recipes-devtools/python/python-vcstools_0.1.26.bb

recipes-devtools/python/python-wstool_0.0.2.bb