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continue to receive watches. This means that it is not necessary to probe around in the xswatch internals to unregister a watch. Tidy up the hotplug watch handling, moving the nested function out to a separate place (I don't think that this was a problem in the end, but it was making me nervous as I was debugging the recent race condition, and I find it clearer out of the class in any case. Pass an integer code representing hotplug status, once it has been parsed from the store, as there are now a few different places we can detect failure, and it's cleaner to pass a code from those places. Small tidy up to XendDomain, removing the unused releaseDomain field.