Security update for systemd (important)

This update for systemd fixes the following issues:

• CVE-2016-7796: A zero-length message received over systemd’s
  notification socket could make manager_dispatch_notify_fd() return an
  error and, as a side effect, disable the notification handler
  completely. As the notification socket is world-writable, this could
  have allowed a local user to perform a denial-of-service attack against
  systemd. (bsc#1001765)

Additionally, the following non-security fixes are included:

• Fix HMAC calculation when appending a data object to journal.
  (bsc#1000435)
• Never accept file descriptors from file systems with mandatory locking
  enabled. (bsc#954374)
• Do not warn about missing install info with "preset". (bsc#970293)
• Save /run/systemd/users/UID before starting [email protected]. (bsc#996269)
• Make sure that /var/lib/systemd/sysv-convert/database is always
  initialized. (bsc#982211)