Security update for qemu (moderate)

This update for qemu fixes the following issues:

This security issue was fixed:

• CVE-2018-12617: qmp_guest_file_read had an integer overflow that could
  have been exploited by sending a crafted QMP command (including
  guest-file-read with a large count value) to the agent via the listening
  socket causing DoS (bsc#1098735)

These non-security issues were fixed:

• Allow kvm group access to /dev/sev (bsc#1102604).
• Fix for the value used for reduced_phys_bits. Please update the
  reduced_phys_bits value used on the commandline or in libvirt XML to the
  value 1 (explicitly set now in QEMU code). (bsc#1103628)
• Fix (again) the qemu guest agent udev rule file, which got unfixed in a
  series of unfortunate events (bsc#1094898 and now bsc#1105279)

This update was imported from the SUSE:SLE-15:Update update project.