make openafs 1.6.2pre3

prerelease for 1.6.2

Change-Id: I1df309f98b003f6ef88289e4219e24ef00dfbf13
Reviewed-on: http://gerrit.openafs.org/8899
Reviewed-by: Stephan Wiesand <stephan.wiesand@desy.de>
Reviewed-by: Paul Smeddle <paul.smeddle@gmail.com>
Reviewed-by: Derrick Brashear <shadow@your-file-system.com>
Tested-by: BuildBot <buildbot@rampaginggeek.com>