viced: make -vhashsize usable for non-DAFS

viced: make -vhashsize usable for non-DAFS

The ability to set the size of the volume hash table was added
at the same time that DAFS was introduced, and got caught up
in the same preprocessor conditional.  However, -vhashsize can
be useful for the traditional fileserver as well (even though
we recommend DAFS over the traditional fileserver), so let it
be used in that case.

Update the man pages accordingly and fix some grammar while here.

Noted by Mark Vitale.

Change-Id: Ic3282c9d661d60cf36f9ffb197e723a3f71da167
Reviewed-on: https://gerrit.openafs.org/12287
Reviewed-by: Mark Vitale <mvitale@sinenomine.net>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>