runv start fail when use kvmtool and xenpv driver

[gao-feng]

[root@think-donkey ubuntu]# runv --driver kvmtool --kernel /home/gaofeng/git/hyperstart/build/arch/x86_64/kernel --initrd /home/gaofeng/git/hyperstart/build/hyper-initrd.img --debug run -b pwd ubuntu
E1025 12:06:43.682859 20342 vm_states.go:309] SB[vm-DnlKEAPgoA] Start POD failed: rpc error: code = Unavailable desc = grpc: the connection is unavailable
E1025 12:06:43.705978 20342 sandbox.go:100] StartPod fail, response: &api.ResultBase{Id:"vm-DnlKEAPgoA", Success:false, ResultMessage:"got failed event when wait init message"}
Failed to load the container after created, err: &os.PathError{Op:"open", Path:"/run/runv/ubuntu/state.json", Err:0x2}

logs:
E1025 12:06:43.702576 20374 proxy.go:82] watchConsole() failed, err: &net.OpError{Op:"dial", Net:"unix", Source:net.Addr(nil), Addr:(*net.UnixAddr)(0xc42025c480), Err:(*os.SyscallError)(0xc42025c4a0)}

#624

[laijs]

the issue is being addressing in #633