Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Give credit where credit is due.

Requested by: Álvaro Castillo
Approved by: cperciva (implicit)

Add Spanish Dvorak keyboard model to syscons.

(not verified to be accurate)

PR: conf/160235
Submitted by: Alvaro <gobledb@gmail.com>
Approved by: cperciva
MFC after: 3 weeks