qemu security update

15:3.0.0-4.el7 - usb-mtp: use ONOFOLLOW and OCLOEXEC. Gerd Hoffmann Orabug: 29056673 CVE-2018-16872 - pvrdma: add uarread routine Prasad J Pandit CVE-2018-20191 - pvrdma: release ring object in case of an error Prasad J Pandit Orabug: 29171822 CVE-2018-20126 - pvrdma: check number of pages when...