Security update for util-linux (important)

This update for util-linux fixes a number of bugs and two security issues.

The following security bugs were fixed:

• CVE-2016-5011: Infinite loop DoS in libblkid while parsing DOS partition
  (bsc#988361)
• CVE-2017-2616: In su with PAM support it was possible for local users to
  send SIGKILL to selected other processes with root privileges
  (bsc#1023041).

The following non-security bugs were fixed:

• bsc#1008965: Ensure that the option "users,exec,dev,suid" work as
  expected on NFS mounts
• bsc#1012504: Fix regressions in safe loop re-use patch set for libmount
• bsc#1012632: Disable ro checks for mtab
• bsc#1020077: fstrim: De-duplicate btrfs sub-volumes for "fstrim -a" and
  bind mounts
• bsc#947494: mount -a would fail to recognize btrfs already mounted,
  address loop re-use in libmount
• bsc#966891: Conflict in meaning of losetup -L. This switch in SLE12 SP1
  and SP2 continues to carry the meaning of --logical-blocksize instead of
  upstream --nooverlap
• bsc#978993: cfdisk would mangle some text output
• bsc#982331: libmount: ignore redundant slashes
• bsc#983164: mount uid= and gid= would reject valid non UID/GID values
• bsc#987176: When mounting a subfolder of a CIFS share, mount -a would
  show the mount as busy
• bsc#1019332: lscpu: Implement WSL detection and work around crash