make 1.6.3pre3

prerelease for OpenAFS 1.6.3

Change-Id: I92e3df57e9c8d55759c317cc8d7743c23c349399
Reviewed-on: http://gerrit.openafs.org/9958
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@your-file-system.com>