packagegroup-self-hosted: Add missing python code

These are in the Toolchain list, so they should also be installed on the build appliance

[YOCTO #5061]

Fixes [YOCTO #5941].

(Partial backport of OE-Core master rev: 82374feece5c576f9950bad6861b1e00c6b30d84)

Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>