afs: Raise osidnlc NCSIZE

afs: Raise osidnlc NCSIZE

The currrent size of the osi DNLC is very small; only 300 entries.
Raise it to 4096 entries, to give it some chance of actually helping.

In the future, of course, this should be runtime configurable, and we
should also raise the hash table size. For now, just raise the number
of entries without changing anything else, to try to make sure nothing
breaks.

With the hash size of 256, this means our hash chains will be at least
16 items long. However, traversing even hundreds of hash items should
still be better than frequently hitting the disk cache to find
entries, and acquiring more locks, etc.

Reviewed-on: https://gerrit.openafs.org/13531
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Michael Meffie <mmeffie@sinenomine.net>
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>
(cherry picked from commit 12b46b6af778625a9c360dca61a59fcf30b76fd1)

Change-Id: Ib4fd8bd01e2df22617e5a549d4ac76ba1d50b2fd
Reviewed-on: https://gerrit.openafs.org/13559
Reviewed-by: Mark Vitale <mvitale@sinenomine.net>
Reviewed-by: Cheyenne Wills <cwills@sinenomine.net>
Reviewed-by: Michael Meffie <mmeffie@sinenomine.net>
Reviewed-by: Marcio Brito Barbosa <mbarbosa@sinenomine.net>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Stephan Wiesand <stephan.wiesand@desy.de>