qemu security update

15:4.2.1-26.el7 - migration: check magic value for deciding the mapping of channels manish.mishra Orabug: 34735462 - io: Add support for MSGPEEK for socket channel manish.mishra Orabug: 34735462 - migration: Move channel setup out of postcopytryrecover Peter Xu Orabug: 34735462 - vdpa: commit all...