jhb 888f6511e3 MFC 263780,264516,265062,265101,265203,265364:
Add an ioctl to suspend a virtual machine (VM_SUSPEND).

Add logic in the HLT exit handler to detect if the guest has put all vcpus
to sleep permanently by executing a HLT with interrupts disabled.

When this condition is detected the guest with be suspended with a reason of
VM_SUSPEND_HALT and the bhyve(8) process will exit.

This logic can be disabled via the tunable 'hw.vmm.halt_detection'.
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