[Users] Host shutdown hangs on vz service stop

[Gregor at HostGIS]

> Unless each VM is stopped from inside it (usually using halt), stopping 
> the container doesn't manage to stop it most of the time, it just blocks.

Does it give a timeout? I had an issue before, where "vzctl stop XXX" 
would eventually time out, leaving the VE in an unpleasant state: no 
processes left, but not stopped so it can't be restarted. Does that 
sound familiar?

For that one, "vzcfgvalidate" showed that I had mistakes in some limits 
and correcting the VE config corrected the issue. We never knew why 
these mistakes would cause stops to timeout, but it did work.

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