If the DISTRO_FEATURES contain systemd then the systemd class won't delete the
units for us. Until the class is fixed to do this automatically, delete them
explicitly.
(From OE-Core rev: d68a86d87aa017dd0fecb0f626d22711efefcd3f)
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>