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>
klog.krb5: Don't hide the -x option

We accept the -x option, even if it doesn't do anything. Don't hide
it, to be honest about what options we accept.

Change-Id: I779558c429b18c97c495c5e9ae81f8630383f572
Reviewed-on: http://gerrit.openafs.org/10420
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@your-file-system.com>
Exit successfully on -help

Running a command with -help is not an error. cmd_Dispatch handles
this correctly, but several server processes call cmd_Parse directly,
and exit with failure on -help. Make them exit successfully instead.

Change-Id: Ieab32ba4a62a182308538469e69320d241dc3aad
Reviewed-on: http://gerrit.openafs.org/10421
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@your-file-system.com>