jepsen.nemesis/compose handles AbstractMethodError thrown by constituent nemeses incorrectly

[visemet]

The jepsen.nemesis/compose function calls jepsen.nemesis/setup-compat! on each of the constituent nemeses. However, if any of those constituent nemeses are jepsen.client.Client instances that don't implement the 3-arity setup! method (because they implement the new-style open! method), then an AbstractMethodError exception is thrown from here and caught in the outer frame for the composite nemesis's call of jepsen.nemesis/setup-compat!. This causes the composite nemesis to be treated as not implementing the 2-arity setup! method, and for the original nemesis argument to be returned unchanged.

I think that jepsen.nemesis/setup-compat! should probably just instead call jepsen.client/open-compat! so it continues to support composing both jepsen.nemesis.Nemesis and jepsen.client.Client instances regardless of whether they're defined using the old-style 3-arity setup! method or the new-style open! method.

[aphyr]

Ah, yeah, I think you're right. Since you have a failing case handy, would you like to submit a PR?