Fixes for NFS in environments with large group memberships

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Hi There!

Last week I fired off a couple patches to this list and in hindsight I
realize that I might not have been totally clear for the motivation
behind the patches:

[PATCH] Use a named constant for max number of managed groups, and inc
[PATCH] Increase the default buffer size for cachelist channel files.

Since nobody has reviewed them yet, I thought I'd make it clear that
these changes (or something along such lines) are required for NFS
access to mountpoints when users are in largeish (>100) numbers of
groups.  There are actually two problems:

* Hard-coded limit for group membership at 100 groups in mountd source
* Large server-side procfs writes are split into mulitple writes due to
stdio buffering in mountd and svcgssd sources, resulting in client
hangs.

The patches in question solve this in as non-intrusive a manner as
possible, though I'm of course open to changing things up if you feel it
should be done otherwise.  So please let me know what you think, or if
it would be better for me to first go and open a bug, start a
discussion, etc.


Thanks,
Sean 
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