Make OpenAFS 1.6.11pre1

prerelease for 1.6.11

Change-Id: I2c8592ae5aa2d3d7e20283064305ce5b6fc74e60
Reviewed-on: http://gerrit.openafs.org/11593
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: D Brashear <shadow@your-file-system.com>
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>
Reviewed-by: Stephan Wiesand <stephan.wiesand@desy.de>