disable Akka.Remote DotNetty batching system inside TestKit by default #4257
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There's been an increase in flaky Akka.Remote tests, and I think #4106 is the likely culprit - since adding those additional ~40ms delays can make it more difficult for some tests with tight time parameters to pass. By default in the TestKit going forward we'll have the batching system disabled via HOCON.
Per #3786