Reduce some internal panics. about raft-rs

[JoshMcguigan]

It looks like fn insert_learner and fn insert_voter both return a Result at this time. At a quick glance, the only way for them to panic would be for the assert_eq check in fn assert_progress_and_configuration_consistent to fail.

Did you want to add a ProgressConfigurationInconsistent error type and return that rather than panic? Or can this issue be marked as resolved for those two methods?

I'd be interested in taking a look at this issue, if you have any guidance on a particular panic! or unwrap which would be a good candidate for removal (assuming the two methods above should be marked as done).

[Hoverbear]

Hi @JoshMcguigan You're right. I think this has been fixed, actually! :( Darnit!