sulogin is provided by both busybox in /sbin/sulogin and util-linux provides one
in /usr/sbin/sulogin, so move util-linux's to sbin and setup ALTERNATIVE_LINK.
[YOCTO #6384]
(From OE-Core rev: a827ca74d27b916df8d40ec8155bc0340f8a0487)
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>