Remove step load feature now that LoadTestShape is possible?

[max-rocket-internet]

This was mentioned by @heyman and it would clean things up a bit. But since settings for LoadTestShape are entirely in the locust file, it has these down sides:

• No option to pass step-load parameters via the UI
• No option to pass step-load parameters via command line

[cyberw]

I'm +1. If you make the PR I will approve it. No need to keep it around as deprecated even, as it hasnt been in the code base for very long. But give an explanatory error message if --step-load is passed.

[max-rocket-internet]

OK. I'll get to it sooner or later. Or if someone else wants to do it sooner, feel free.

[cyberw]

@max-rocket-internet Do you think you'll have time to do this? I would like to make a new release soon, and would prefer to do this first.

[max-rocket-internet]

I will have time but not for 1-2 weeks.

[cyberw]

Ok, I'll make a note here if I start working on it. Maybe we'll do it for next release instead.