qemu-kvm security and bug fix update

[0.12.1.2-2.355.el6_4.5]

• kvm-e1000-fix-link-down-handling-with-auto-negotiation.patch [bz#907716]
• kvm-e1000-unbreak-the-guest-network-when-migration-to-RH.patch [bz#907716]
• kvm-reimplement-error_setg-and-error_setg_errno-for-RHEL.patch [bz#957056]
• kvm-qga-set-umask-0077-when-daemonizing-CVE-2013-2007.patch [bz#957056]
• kvm-qga-distinguish-binary-modes-in-guest_file_open_mode.patch [bz#957056]
• kvm-qga-unlink-just-created-guest-file-if-fchmod-or-fdop.patch [bz#957056]
• Resolves: bz#907716
  (use set_link to change rtl8139 and e1000 network card’s status but fail to make effectively after reboot guest)
• Resolves: bz#957056
  (CVE-2013-2007 qemu: guest agent creates files with insecure permissions in deamon mode [rhel-6.4.z])
  [0.12.1.2-2.355.el6_4.4]
• kvm-virtio-balloon-fix-integer-overflow-in-BALLOON_CHANG.patch [bz#958750]
• Resolves: bz#958750
  (QMP event shows incorrect balloon value when balloon size is grater than or equal to 4G)