RFC: Changes to handbook on virtualization

[Dee Nixon]

A few weeks ago we volunteered to add some new material, primarily
about bhyve, to the section on virtualiation in the FreeBSD
handbook.   You can see our nearly-final draft (pending any comments
from the list, and pending the repair of VirtualBox so it can work
with FreeBSD 10) at:

    http://www.petitecloud.org/handbook.jsp

We would appreciate comments, especially any corrections or
suggested clarifications regarding bhyve.