Add support for configuration of MacOS 10.10 "Yosemite"

This is just the configuration part of  the patch submitted
in the RT ticket. The packaging part will will follow in the
next change.

FIXES 131946

Reviewed-on: http://gerrit.openafs.org/11560
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>
Reviewed-by: D Brashear <shadow@your-file-system.com>
(cherry picked from commit 4109785a891d802194ad11edb600a61de316d262)

Change-Id: I5800a89ef06bfad31ee284637fc0685b82e9693f
Reviewed-on: http://gerrit.openafs.org/11571
Reviewed-by: Andrew Deason <adeason@sinenomine.net>
Tested-by: Stephan Wiesand <stephan.wiesand@desy.de>
Reviewed-by: Stephan Wiesand <stephan.wiesand@desy.de>