Rebase to pending 1.6.1 stable
CVE-2013-4377: Fix crash when unplugging virtio devices (bz #1012633, bz #1012641)
Fix 'new snapshot' slowness after the first snap (bz #988436)
Fix 9pfs xattrs on kernel 3.11 (bz #1013676)
CVE-2013-4344: buffer overflow in scsi_target_emulate_report_luns (bz #1015274, bz #1007330)