Relay all HTTP client related errors to the evaluators through crowdAINotifier

[spMohanty]

Careful about the initial retries though. The idea is that anytime the model or the attacker "gives up", it should relay the same to the evaluator, with a meaningful message. Currently a misbehaving model or attacker is anyway caught by the orchestrator when it notices that a container is dead, but its hard to put a good message in that case, which can be very confusing for the participants.