Add the manual page for the sab(4) driver. Driver code was originally obtained from NetBSD. This is the OpenBSD version of the manual page with a few fixes.
Add the manual page for the sab(4) driver. Driver code was originally
obtained from NetBSD. This is the OpenBSD version of the manual page with
a few fixes.

Approved by:	jake (mentor)
Obtained from:	OpenBSD

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase