categorize command options

[nak3]

commands especially torusd have about 20 options. Categorizing them (like etcd below) would be helpful for users.

$ ./bin/etcd -h

  ... 

member flags:
    --name 'default'
        human-readable name for this member.
    --data-dir '${name}.etcd'
        path to the data directory.

       ...

clustering flags:
    --initial-advertise-peer-urls 'http://localhost:2380'
        list of this member's peer URLs to advertise to the rest of the cluster.

       ...

[barakmich]

You've done a good bit of cleanup around those, but I agree. Like etcd, like kubectl, having full help strings for our binaries would be a good idea.