python: User base directory is ~/.local

[alaviss]

$ python -c 'import site; site.getuserbase()'
/boot/home/.local
$ python3 -c 'import site; site.getuserbase()'
/boot/home/.local

This should be moved to B_USER_NONPACKAGED_DIRECTORY

[OscarL]

For whatever its worth, with Python 3.7.12, python3 -c 'import site; print(site.getuserbase())' returns:

/boot/home/config/non-packaged

Not sure about Python2.7. Maybe this can be closed, unless we still care about 2.7 for some reason.

[OscarL]

Time to close this one, as Python 2.x is no more, and the versions we currently support have this already fixed.

cc @Begasus :-)