Increase the nfs access cache timeout from 2 to 60.  The latter is a more appropriate value and is also the default set by the kernel.  I could not find a justification of why rc.conf began overriding it back in 1998.
Increase the nfs access cache timeout from 2 to 60.  The latter is a
more appropriate value and is also the default set by the kernel.  I
could not find a justification of why rc.conf began overriding it back
in 1998.

This dramatically cuts NFS traffic on e.g. a busy system with NFS root.

Reviewed by:	mohans
MFC After:	2 weeks

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase