Security update for cups (moderate)

This update for cups fixes the following issues:

The following security vulnerabilities were fixed:

• CVE-2017-18248: Handle invalid characters properly in printing jobs.
  This fixes a problem that was causing the DBUS library to abort the
  calling process. (bsc#1061066 bsc#1087018)
• Fixed a local privilege escalation to root and sandbox bypasses in the
  scheduler
• CVE-2018-4180: Fixed a local privilege escalation to root in dnssd
  backend (bsc#1096405)
• CVE-2018-4181: Limited local file reads as root via cupsd.conf include
  directive (bsc#1096406)
• CVE-2018-4182: Fixed a sandbox bypass due to insecure error handling
  (bsc#1096407)
• CVE-2018-4183: Fixed a sandbox bypass due to profile misconfiguration
  (bsc#1096408)

The following other issue was fixed:

• Fixed authorization check for clients (like samba) connected through the
  local socket when Kerberos authentication is enabled (bsc#1050082)

This update was imported from the SUSE:SLE-12:Update update project.