makefile.python: partial revert off 9b48ae47, adds py2 support back

revert "makefile.python: ... drop build support py2" to get back Py2 support.
TPy2 support need virtualenv installed by the OS.

BTW: log environment and python version in travis's install phase

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>