Make OpenAFS 1.6.6

Update version strings for 1.6.6

Change-Id: I52c88bc22d4f058a32c34e8690385b1cf116c7d6
Reviewed-on: http://gerrit.openafs.org/10330
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
Reviewed-by: Stephan Wiesand <stephan.wiesand@desy.de>