systemd-ptest also needs a Python interpretter. Also remove the redundant
comment.
systemd-kernel-install is a bash script that can't be trivially ported to POSIX
sh.
(From OE-Core rev: 9f6b34493d332f9eff54c3eb2da9483a344e6d3c)
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>