LoadGenerator.interrupt() does not work reliably

[sbordet]

Calling LoadGenerator.interrupt() does interrupt the load generation, but it may return a CompletableFuture that is not exceptionally completed due to the interruption.

This is because the requests sent prior the interruption may be already completed, so CompletableFuture.anyOf(allResults, anyFailure) may return the succeeded allResults rather than the failed anyFailure.

A more robust way to complete the CompletableFuture returned from process() is necessary.