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Disable system out for dropped connections

See original GitHub issue

At least conditionally, otherwise any benchmarking session hangs after a single-shot run and prints every connection to System.out

2018-08-28 12:43:54.623 [engine-thread] ERROR Application - 200 OK: GET - /
java.io.IOException: Connection reset by peer
        at sun.nio.ch.FileDispatcherImpl.write0(Native Method)
        at sun.nio.ch.SocketDispatcher.write(SocketDispatcher.java:47)
        at sun.nio.ch.IOUtil.writeFromNativeBuffer(IOUtil.java:93)
        at sun.nio.ch.IOUtil.write(IOUtil.java:51)
        at sun.nio.ch.SocketChannelImpl.write(SocketChannelImpl.java:471)
        at io.ktor.network.sockets.CIOWriterKt$attachForWritingDirectImpl$1$1.doResume(CIOWriter.kt:73)
        at kotlin.coroutines.experimental.jvm.internal.CoroutineImpl.resume(CoroutineImpl.kt:42)
        at kotlinx.coroutines.experimental.DispatchedTask$DefaultImpls.run(Dispatched.kt:150)
        at kotlinx.coroutines.experimental.io.internal.MutableDelegateContinuation.run(MutableDelegateContinuation.kt:14)
        at io.ktor.network.util.IOCoroutineDispatcher$IODispatchedTask.run(IOCoroutineDispatcher.kt)
        at io.ktor.network.util.IOCoroutineDispatcher$IOThread$run$1.doResume(IOCoroutineDispatcher.kt:73)
        at kotlin.coroutines.experimental.jvm.internal.CoroutineImpl.resume(CoroutineImpl.kt:42)
        at kotlinx.coroutines.experimental.DispatchedTask$DefaultImpls.run(Dispatched.kt:150)
        at kotlinx.coroutines.experimental.DispatchedContinuation.run(Dispatched.kt:14)
        at kotlinx.coroutines.experimental.EventLoopBase.processNextEvent(EventLoop.kt:136)