snapshot: fine-tune qemu snapshot revert states
For a system checkpoint of a running or paused domain, it's fairly easy to honor new flags for altering which state to use after the revert. For an inactive snapshot, the revert has to be done while there is no qemu process, so do back-to-back transitions; this also lets us revert to inactive snapshots even for transient domains. * src/qemu/qemu_driver.c (qemuDomainRevertToSnapshot): Support new flags.
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