ramping.py calls RequestStats.sum_stats() which is no longer a valid call

[einchance]

ramping.py attempts to call RequestStats.sum_stats() in 3 different places. This is no longer a valid call after the refactoring of the request statistics code

d1cc5ac

[Jahaja]

I'm not convinced that the parts related to ramping should remain in the Locust core. What do you guys think @cgbystrom @heyman?

I think it would probably be more appropriate as a plugin given that we could create a simple plugin architecture with such fine-grained control.

[heyman]

Since it's broken in the current version I think we should either fix it + document it, or cut it out. I'm leaning more towards cutting it out to keep the core features smaller, and hopefully be able to provide the possibility to add this kind of functionality through plugins in the future.

[Jahaja]

Fixed in e5ba814