Don't raise error message from cgroups if QEMU fails to start
Don't raise error message from cgroups if QEMU fails to start

The code to remove the cgroup after QEMU failed to startup could
be obscuring a real error from earlier on. It is not neccessary
to raise an error in this case, so tell cgroups to keep quiet

* src/qemu/qemu_driver.c: Don't raise cgroups error in QEMU start
  cleanup code.

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