fix a deadlock when qemu cannot start
When qemu cannot start, we may call qemuProcessStop() twice. We have check whether the vm is running at the beginning of qemuProcessStop() to avoid libvirt deadlock. We call qemuProcessStop() with driver and vm locked. It seems that we can avoid libvirt deadlock. But unfortunately we may unlock driver and vm in the function qemuProcessKill() while vm->def->id is not -1. So qemuProcessStop() will be run twice, and monitor will be freed unexpectedly. So we should set vm->def->id to -1 at the beginning of qemuProcessStop().
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