qemu: increase the timeout before sending SIGKILL to qemu process
The current default method of terminating the qemu process is to send a SIGTERM, wait for up to 1.6 seconds for it to cleanly shutdown, then send a SIGKILL and wait for up to 1.4 seconds more for the process to terminate. This is problematic because occasionally 1.6 seconds is not long enough for the qemu process to flush its disk buffers, so the guest's disk ends up in an inconsistent state. Since this only occasionally happens when the timeout prior to SIGKILL is 1.6 seconds, this patch increases that timeout to 10 seconds. At the very least, this should reduce the occurrence from "occasionally" to "extremely rarely". (Once SIGKILL is sent, it waits another 5 seconds for the process to die before returning). Note that in the cases where it takes less than this for qemu to shutdown cleanly, libvirt will *not* wait for any longer than it would without this patch - qemuProcessKill polls the process and returns as soon as it is gone.
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