Merge commit 'v0.10.3' into stable-0.10
* commit 'v0.10.3':
Update version for 0.10.3 release
Implement cancellation method for dma async I/O (Avi Kivity)
Convert vectored aio emulation to use a dedicated pool (Avi Kivity)
Refactor aio callback allocation to use an aiocb pool (Avi Kivity)
Fix hw/acpi.c build w/ DEBUG enabled
Make sure not to fall through on error in loadvm
Pci nic: pci_register_device can fail
Fix serial option with -drive
suport device driver initialization model
kvm: Avoid COW if KVM MMU is asynchronous
vnc: windup keypad keys for qemu console emulation