featreq: support for multiple URLs

[iggy]

It would be nice to be able to specify a list of URLs to send traffic to.

Not sure how best to handle the division of URLs vs traffic, but for my personal needs a simple round-robin across the URLs would work. I.e. with 2 URLs: request1 -> url1, request2 -> url2, request3 -> url1, request4 -> url2, etc.

[nakabonne]

@iggy Hey, thank you for your suggestion! Actually I'm looking into that, but at the same time I would definitely like to keep this tool as simple as possible. We need to think about other stuff, e.g. how to draw the charts, etc.

[raff]

Vegeta seems to support a formatted body that can contain multiple URLs/methods/body (you have to create a different type of targeter instead of using NewStaticTargeter with a single request)

It should be pretty easy to add an option that instruct the attacker to create the different type of targeter.
Would you accept a pull request for that ?