Add support for configuration of MacOS 10.9 "Mavericks".

Based on work originally done by Matt Haught <dmhaught@ncsu.edu>

Change-Id: I331cfc0040fab526c32e24f6af970f352f0a0a8e
Reviewed-on: http://gerrit.openafs.org/10538
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@your-file-system.com>