pull into stable branch
base openbsd support
====================
This delta was composed from multiple commits as part of the CVS->Git migration.
The checkin message with each commit was inconsistent.
The following are the additional commit messages.
====================
openbsd config files, from devel branch
(cherry picked from commit b80f8ab2cb)
at build time, create a subtree for use later which can be used to
build *only* kernel modules, but only for the afs sysname you were building
for in the first place currently.
