p9fs (bhyve) success report

hello,

as this has come up before here (and didn't make it into the quarterly status
report), i just wanted to mention that i'm currently using p9fs(5) in -current
to export a filesystem from the host to a bhyve VM and, after some fixes made
in October, it's been rock solid for me.

this is a *lot* easier than using NFS/SMB to export filesystems to a VM, and
brings FreeBSD up to par with Linux as a VM guest.

so, thank you to everyone who was involved in implementing and merging this.

for reference, the configuration on the bhyve host:

	-s 5:0,virtio-9p,torrents=/data/public/Torrents,rw

and in the VM's /etc/fstab:

	torrents /data/public/Torrents p9fs rw 0 0

i do think the manpage should be in section 4 though, so i submitted a PR for
that (https://github.com/freebsd/freebsd-src/pull/1520).