Create py2-cmd which behaves more like the normal `python`

Instead of executing the __main__.py inside the par file, it'll use all
the normal python command line options, allowing you to replace python
in $PATH with this executable.

Also add distutils, which some script expect to be in the stdlib.

Bug: 117811537
Test: move py2-cmd to prebuilts/build-tools/path/linux-x86/python and build
Change-Id: Iddab6ab4db23f99953ecf4d42cd7d966851b1e1b