libnewt: split python module into libnewt-python

libnewt: split python module into libnewt-python

This is useful as it avoids pulling python into a build just to build
chkconfig. The python recipe uses the libnewt installed in the sysroot by the
main package, so there's little loss of build time, other than the additional
unpack/patch.

(From OE-Core rev: b255ebbf8283568d732827086bf0bd2b8db1d905)

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