qemu-kvm CVE-2016-1756 breaks migration of instances

CVE-2016-1756, libvirt, live migration, openstack, qemu-kvm, redhat

https://bugzilla.redhat.com/show_bug.cgi?id=1371943

work around

disable memstat in nova.conf on compute nodes

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[libvirt]
mem_stats_period_seconds=0

disable memstats on running instances

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virsh dommemstat instance-00000068 --period 0 --live