If found, set HOST_INFO::p_vm_extensions_disabled,
and pass this to the scheduler.
- scheduler (VBox app plan function) if a host has p_vm_extensions_disabled
set, don't sent it multicore VBox jobs.
Note: if you have a host with VM extensions, and they're disabled
in the BIOS, and you enable them, you can remove the
<p_vm_extensions_disabled> line from client_state.xml
and you'll be eligible to get multicore VM jobs again.
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