All commands are retryable based on the backend

[dcramer]

Discuss.

[dcramer]

If no one comes up with a good reason why the default is False I will push this out. If a connection dictates X exception can retry, it should be retryable outside of things like RoundRobinRouter. If that's not true then it shouldn't be classified as generic retries, and the roundrobinrouter should have some other router-specific code that designates "node down retryable failures".

Specifically using this as a replacement for something like the Riak client isn't useful if retries are handled generically.

[Fluxx]

Cool with me. You should remove anywhere where retryable = True and add retryable = False to the routers that need it though.