Security update for libvirt (important)

This update for libvirt and virt-manager fixes the following issues:

Security issues fixed:

• CVE-2017-5715: Fixes for speculative side channel attacks aka
  "SpectreAttack" (var2) (bsc#1079869).
• CVE-2018-6764: Fixed guest executable code injection via libnss_dns.so
  loaded by libvirt_lxc before init (bsc#1080042).
• CVE-2018-1064: Fixed denial of service when reading from guest agent
  (bsc#1083625).

Non-security issues fixed in libvirt:

• bsc#1070615: Fixed TPM device passthrough failure on kernels >= 4.0.
• bsc#1082041: SUSE Linux Enterprise 11 SP4 hvm converted to pvhvm. Unless
  vm memory is on gig boundary, vm won’t boot.
• bsc#1082161: Unable to change RTC basis or adjustment for Xen HVM guests
  using libvirt.

Non-security issues fixed in virt-manager:

• bsc#1086038: VM guests cannot be properly installed with virt-install
• bsc#1067018: KVM Guest creation failed - Property .cmt not found
• bsc#1054986: Fix openSUSE 15.0 detection. It has no content file or
  .treeinfo file
• bsc#1085757: Fallback to latest version of openSUSE when
  opensuse-unknown is detected for the ISO