qemu-kvm security and bug fix update

[1.5.3-86.el7_1.5]

• kvm-i8254-fix-out-of-bounds-memory-access-in-pit_ioport_.patch [bz#1243726]
• Resolves: bz#1243726
  (CVE-2015-3214 qemu-kvm: qemu: i8254: out-of-bounds memory access in pit_ioport_read function [rhel-7.1.z])
  [1.5.3-86.el7_1.4]
• kvm-ide-Check-array-bounds-before-writing-to-io_buffer-C.patch [bz#1243689]
• kvm-ide-atapi-Fix-START-STOP-UNIT-command-completion.patch [bz#1243689]
• kvm-ide-Clear-DRQ-after-handling-all-expected-accesses.patch [bz#1243689]
• Resolves: bz#1243689
  (EMBARGOED CVE-2015-5154 qemu-kvm: qemu: ide: atapi: heap overflow during I/O buffer memory access [rhel-7.1.z])
  [1.5.3-86.el7_1.3]
• kvm-atomics-add-explicit-compiler-fence-in-__atomic-memo.patch [bz#1233643]
• Resolves: bz#1233643
  ([abrt] qemu-kvm: bdrv_error_action(): qemu-kvm killed by SIGABRT)