[pve-devel] don't try to hotplug/unplug is device exist/don't exist

Derumier Alexandre aderumier at odiso.com
Sun Feb 5 14:19:05 CET 2012

Beforce hotplug/unplug, check if device exist or not.

This correct update of options of an already plugged device.(like changing disk cache or backup option).

This also correct hot-unplug of a non existing device. 
(If hotplug failed before, but device exist in config, we can now remove it)

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