Make OpenAFS 1.6.6pre1

prerelease for 1.6.6

Change-Id: I4d93c9937316f47f06727a81deefab253de46030
Reviewed-on: http://gerrit.openafs.org/10343
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@your-file-system.com>
Reviewed-by: Stephan Wiesand <stephan.wiesand@desy.de>