python: fix python path setting in plain cmake workspaces #618
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In plain cmake workspaces the python install dir is set to
lib/python2/dist-packages instead of lib/python2.7/dist-packages
I checked the catkin/cmake/python.cmake file and in that file there is
an extra check for the version, so I assume that we should only use
the major version in case the major version is 3 or higher.