Python update 5

Fix builds. 
https://github.com/openwrt/packages/issues/518 & http://buildbot.openwrt.org:8010/broken_packages/ar71xx.mikrotik/python/compile.txt

Making `python` ==> `python-base` and `python-full` ==> `python`.
This is the final packaging/switch/etc.
From now it's just `python-base` and `python`.
Anything in-between is difficult to maintain for the main Python package.

Users that want to install Python should install the standard python installation (out-of-the-box).
If they cannot fit the full Python install, they should use `python-base` and install whatever libs they need.
I have a work-in-progress for adding `python-base` + whatever libs are needed.

Signed-off-by: Alexandru Ardelean <ardeleanalex@gmail.com>