bozo: Remove dead code and minor cleanup

This stuff has been #if 0'd for ages; put it out of its misery.

While here, remove the global bnode_waiting which is not used for anything.

bnode_SoftInt claims to return a pointer, so return NULL instead of 0.

Reviewed-on: http://gerrit.openafs.org/10284
Reviewed-by: Chas Williams - CONTRACTOR <chas@cmf.nrl.navy.mil>
Reviewed-by: Derrick Brashear <shadow@your-file-system.com>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
(cherry picked from commit 54eb2485b59550ba42569ed3a8d76211a3a35019)

Change-Id: Ife2604f1a99ef81e2075a82cb97d94ae5373031c
Reviewed-on: http://gerrit.openafs.org/10864
Reviewed-by: D Brashear <shadow@your-file-system.com>
Reviewed-by: Andrew Deason <adeason@sinenomine.net>
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Stephan Wiesand <stephan.wiesand@desy.de>