Do not hide -enable_{peer,process}_stats

Do not hide -enable_{peer,process}_stats

Both afsd and kaserver accepted the -enable_peer_stats and
-enable_process_stats options, but they did not include the options in
their usage message. We already document these flags in the manpages,
so also include them in the usage message; they are not a secret.

Change-Id: Ic1ff0e8c0dcd07e2721676b09a53c30a3db3ee9d
Reviewed-on: http://gerrit.openafs.org/10419
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@your-file-system.com>