This adds the ability to control the CPU topology of created VMs from userland
without the need to tweak sysctls, it allows the old sysctls to continue to function.
The command line of bhyve is maintained in a backwards compatible way.
The API of libvmmapi is maintained in a backwards compatible way.
The sysctl's are maintained in a backwards compatible way.
Added command option looks like:
bhyve -c [cpus=]n[,sockets=n][,cores=n][,threads=n][,maxcpus=n]
The optional parts can be specified in any order, but only a single integer
invokes the backwards compatible parse.
bhyvectl --get-cpu-topology option added.