The only use for callbacks for NFSv4.0 is delegations
and delegations rarely work well for NFSv4.0 anyhow.
Therefore, this patch disables callbacks for the
NFSv4.0 client. This is the same behavior as
occurred when the nfscbd(8) daemon was not running.
This change allowed a function called nfscl_getmyip()
to be removed from the kernel, which is nice since
maintaining this function was bothersome, due to its
use of routing, etc.
MFC after: 2 weeks
Rick Macklem
71ac1ec5c9