Important: qemu security update (Oracle Linux 7)

[15:3.0.0-3.el7]
- monitor: guard iothread access by mon->use_io_thread (Wolfgang Bumiller) [Orabug: 29046045]
- monitor: delay monitor iothread creation (Wolfgang Bumiller) [Orabug: 29010480]
- Revert 'qmp: isolate responses into io thread' (Marc-Andre Lureau) [Orabug: 29010480]
- usb-mtp: outlaw slashes in filenames (Gerd Hoffmann) [Orabug: 29037012] {CVE-2018-16867}

[15:3.0.0-2.el7]
- vfio-pci: emit FAILOVER_PRIMARY_CHANGED event on guest behalf when unrealized (Si-Wei Liu) [Orabug: 29011784]
- vfio-pci: add FAILOVER_PRIMARY_CHANGED event to shorten downtime during failover (Si-Wei Liu) [Orabug: 29011776]
- virtio_net: Add support for 'Data Path Switching' during Live Migration. (Venu Busireddy) [Orabug: 28732921]
- parfait: Run static analysis when --with parfait specified (Liam Merwick) [Orabug: 28625099]
- parfait: add buildrpm/parfait-qemu.conf (Liam Merwick) [Orabug: 28625099]
- configure: Provide option to explicitly disable AVX2 (Liam Merwick) [Orabug: 28625099]
- lsi53c895a: convert to trace-events (Mark Cave-Ayland) [Orabug: 29011792]
- lsi: Reselection needed to remove pending commands from queue (George Kennedy) [Orabug: 28626593]
- lsi53c895a: check message length value is valid (Prasad J Pandit) [Orabug: 28873239] {CVE-2018-18849}
- 9p: fix QEMU crash when renaming files (Greg Kurz) [Orabug: 28971710] {CVE-2018-19489}
- 9p: take write lock on fid path updates (CVE-2018-19364) (Greg Kurz) [Orabug: 28957033] {CVE-2018-19364}
- nvme: fix out-of-bounds access to the CMB (Paolo Bonzini) [Orabug: 28885521] {CVE-2018-16847}
- kvm: x86: Fix kvm_arch_fixup_msi_route for remap-less case (Jan Kiszka) [Orabug: 28891193]
- i386: Add new model of Cascadelake-Server (Tao Xu) [Orabug: 28886460]
- i386: Add PKU on Skylake-Server CPU model (Tao Xu) [Orabug: 28886461]