Use cmake install instead of setup.py to install python wrapping.

Distutils path is not well maintained and from what packagers
tell me, largely unused. It is also buggy and hard to use.
Removing it and letting CMake install instead. Doing this will
properly remove rpath and likely fix other bugs.

Change-Id: I60f375449344bcd8b2b2823c248eb69163026a3a
export python module installation directory for reuse

for use by other vtk modules that make and install python modules

Change-Id: Ia043b89c540df6de6af713c7c634833ab4b1d718
Merge topic 'use-cmake-install-instead-of-setup-py' into master

2f6111f1 export python module installation directory for reuse
beae7c64 Use cmake install instead of setup.py to install python wrapping.