Add hostctl(8), a tool to access key-value stores on the host,
currently for hypervisor information stores on pvbus(4).

As discussed with deraadt@, the generic name is used to potentially
extend it

Add hostctl(8), a tool to access key-value stores on the host,
currently for hypervisor information stores on pvbus(4).

As discussed with deraadt@, the generic name is used to potentially
extend it for other use cases where the host or machine firmware
provides a key-value store, hypervisors or things like openprom.

Not enabled yet.

OK mikeb@

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