try mocha 3

[evgeni]

No description provided.

[ekohl]

This part is now default (which I think was the only breaking change):

foreman/test/test_helper.rb

Lines 37 to 39 in 74ddd88

	Mocha.configure do |config|
	config.strict_keyword_argument_matching = true
	end

Should we drop those lines?

[evgeni]

If we bump the minimum version to 3, yeah.

This PR was just to see if things horribly break (they didn't 🎉) after I've seen the rc1 announcement by @floehopper

[ekohl]

Yes, I noticed it was a draft and rc. Still nice it didn't crash & burn