qemu: Transition domain to PAUSED after 'stop' command
Currently, we mark domain PAUSED (but not emit an event) just before we issue 'stop' on monitor; This command can take ages to finish, esp. when domain's doing a lot of IO - users can enforce qemu to open files with O_DIRECT which doesn't return from write() until data reaches the block device. Having said that, we report PAUSED even if domain is not paused yet.
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