Revert "don't try to complete self.pylibdir, it is complete"

This reverts commit 0c9962f4c5a9ca1ba94c12c014563476b8337195.
Revert "stop hardcoding Python lib dir, determine it via get_python_lib instead"

This reverts commit ec84222de2938ab3339dff29ea55356698907deb.
obtain Python site lib dir via distutils.sysconfig.get_python_lib() through run_cmd to get correct version
style fix
Merge branch 'develop' of github.com:hpcugent/easybuild-easyblocks into develop
Merge branch 'develop' into revert_pyver
indentation matters, so don't join on spaces
add missing super call
strip output of run_cmd
fix typo (I really need sleep)
Merge pull request #156 from boegel/revert_pyver

don't rely on distutils.sysconfig directly to determine Python lib dir