bozo: Remove dead code and minor cleanup

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.

Change-Id: Ie7b32bbc606a105190d246355f47bd7ea885c6f8
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>