Add non-US keyboard support to bhyve

Using FreeNAS-11.0-RC4 (ccc181927).

Bhyve virtual machines profoundly mangle keyboard input when using the Spanish keyboard (and presumably any non-US keyboard) on the host machine. This occurs regardless of the VNC client I use (TigerVNC, Vinagre, etc.).

The keys a-z and 0-9 are handled CORRECTLY. Few other keys are. I've made a chart and posted it here: http://imgur.com/a/F6BQm (Pink = Incorrect; "(DK)" = dead key).

Needless to say, this makes bhyve VMs essentially useless for any tasks that involve the keyboard.