It seems that this can become an issue.
Found when building python3-setuptools from packages/trunk
in openwrt/15.05.

python3-setuptools is not in packages/for-15.05

Signed-off-by: Alexandru Ardelean <ardeleanalex@gmail.com>

Packetize some Python modules to reduce size of the overall Python package.
Basically, a new package is introduced, call `python-light`,
and everything that's extra (or big) is put in other packages.

The `python` package becomes a metapackage that installs `python-light`
along with the rest of the packages.

Base work started by Jan Čermák.

Signed-off-by: Jan Čermák <jan.cermak@nic.cz>
Signed-off-by: Alexandru Ardelean <ardeleanalex@gmail.com>