clean up cmdline arguments & defaults

[teepark]

The main package command line arguments are currently done in a mix of styles:

• tcpaddr is an ip:port address with no default
• raftaddr and raftport together form the bind location for the raft protocol
• serfport is just the port with a default value -- the IP is hard-coded to 0.0.0.0.
• raftdir is actually ignored, instead logdir/raft is always used

I propose getting rid of raftdir, and standardizing on ip:port arguments with defaults serving on all interfaces (0.0.0.0). Ideally the beginner, experimenting, can get started with a single-node cluster by just running jocko.

Would you accept a PR like this?

[travisjeffery]

Yep, I'd accept a PR. Thanks.

[travisjeffery]

Ah I ended up writing one. Let me know what you think about that. The Raft one has to be set to 127.0.0.1 and set at times when you want to advertise otherwise. Hashicorp's Consul works the same way.

[teepark]

Nice! I'll go ahead and make a PR from my WIP, see if there's anything worth borrowing there :)