util-linux: upgrade to 2.28

util-linux: upgrade to 2.28

Related patches are rebased.

util-linux-ng-2.16-mount_lock_path.patch is removed because there's
no _PATH_MOUNTED_LOCK in the latest codes.

util-linux-native.patch is removed because 2.28 version of util-linux
has taken mkostemp into consideration and provide fallback if mkostemp
fails.

avoid_unsupported_sleep_param.patch is removed and coreutils is added
as a runtime dependency to util-linux-ptest to solve the same problem.

avoid_unsupported_grep_opts.patch is removed and grep is added as a
runtime dependency to util-linux-ptest to solve the sanme problem.

Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>