[Bug 201578] Update bhyve chapter with note on CPU UG feature & zfs vol examples

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=201578

            Bug ID: 201578
           Summary: Update bhyve chapter with note on CPU UG feature & zfs
                    vol examples
           Product: Documentation
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: Documentation
          Assignee: freebsd-doc at FreeBSD.org
          Reporter: shawn at debnath.net

Created attachment 158786
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=158786&action=edit
SVN diff en_US.ISO8859-1/books/handbook/virtualization/chapter.xml

To run a bhyve guest with multiple vCPUs, the "VMX unrestriced mode" or
"unrestricted guest privileges (UG)" mode is required from the CPU. The current
section in the handbook doesn't mention this and may throw new folks off as
they are getting started with FreeBSD and bhyve. See Peter Grehan's note in
this thread:
http://freebsd.1045724.n5.nabble.com/VM-unrestricted-guest-capability-required-td5953993.html

Also, since ZFS is getting quite popular within the FreeBSD community, it seems
fit to show the user how to create a zfs volume for use with bhyve.

This change adds a couple sentences in the intro paragraph about the required
CPU UG feature if they are planning on creating vms with multiple vCPUS and
also adds a section titled "Using ZFS with Bhyve Guests".

Comments, feedback welcome. Happy to change as you guys see fit.

Thanks,
Shawn

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