Make OpenAFS 1.6.6pre2

prerelease for 1.6.6

Change-Id: I51010e70d1a9377f7a82d48798dc2b439e5bb4f5
Reviewed-on: http://gerrit.openafs.org/10344
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@your-file-system.com>
Reviewed-by: Stephan Wiesand <stephan.wiesand@desy.de>