viced ihandle boost

viced ihandle boost

Make ihandle file descriptor cache parameters tunable, and accommodate
platforms where max open files is large.  Expand the fd cache hash table
to 2048 entries.  Raise fd cache size automatically to match configured
number of lwps.

NOTE: This code has been tested on Centos 5.3 x86_64, on VMWare, 2 physical,
2 logical CPUs (in tandem with viced_more_threads).

LICENSE BSD

Change-Id: If68eda6e1c955e026b250ca52bddf0b8383959c9
Change-Id: I5fbbec95523ea9cd9ff42dcf43f17db94c7bb161
Reviewed-on: http://gerrit.openafs.org/584
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: Derrick Brashear <shadow@dementia.org>