[oe] Full Python3 Installation

[Fabjan Sukalia]

Hi all!

I'm working with a Poky installation on a Zynq-Board. I have added python3
to the image with

CORE_IMAGE_EXTRA_INSTALL_append = " python3"

With this python3 is available on the target system but sadly not all
modules are installed like on an usual desktop system, e.g. sockets can't
be used because the selector module is missing, also the subprocess module
is missing.

How do I get a "full" python installation that is comparable with desktop
systems? Thanks in advance.

Best regards,
Fabjan Sukalia