Exceptions in docker tests locally

[codefromthecrypt]

Not sure why this doesn't fail in travis. Maybe we need to guard stuff more specifically

java.util.concurrent.CompletionException: java.net.UnknownHostException: failed to resolve 'macbook-pro-7.local' after 3 queries 
	at java.base/java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:331)
	at java.base/java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:346)
	at java.base/java.util.concurrent.CompletableFuture$BiRelay.tryFire(CompletableFuture.java:1423)
	at java.base/java.util.concurrent.CompletableFuture$CoCompletion.tryFire(CompletableFuture.java:1144)
	at java.base/java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:506)
	at java.base/java.util.concurrent.CompletableFuture.completeExceptionally(CompletableFuture.java:2088)
	at com.linecorp.armeria.common.HttpMessageAggregator.fail(HttpMessageAggregator.java:146)
	at com.linecorp.armeria.common.HttpMessageAggregator.onError(HttpMessageAggregator.java:60)
	at com.linecorp.armeria.common.stream.AbstractStreamMessage$CloseEvent.notifySubscriber(AbstractStreamMessage.java:370)
	at com.linecorp.armeria.common.stream.DefaultStreamMessage.notifySubscriberOfCloseEvent(DefaultStreamMessage.java:194)
	at com.linecorp.armeria.common.stream.DefaultStreamMessage.handleCloseEvent(DefaultStreamMessage.java:363)
	at com.linecorp.armeria.common.stream.DefaultStreamMessage.notifySubscriber0(DefaultStreamMessage.java:306)
	at com.linecorp.armeria.common.stream.DefaultStreamMessage.notifySubscriber(DefaultStreamMessage.java:253)
	at com.linecorp.armeria.common.stream.DefaultStreamMessage.addObjectOrEvent(DefaultStreamMessage.java:239)
	at com.linecorp.armeria.common.stream.DefaultStreamMessage.tryClose(DefaultStreamMessage.java:391)
	at com.linecorp.armeria.common.stream.DefaultStreamMessage.close(DefaultStreamMessage.java:380)
	at com.linecorp.armeria.client.HttpClientDelegate.finishResolve(HttpClientDelegate.java:114)
	at com.linecorp.armeria.client.HttpClientDelegate.lambda$execute$0(HttpClientDelegate.java:96)
	at io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:500)
	at io.netty.util.concurrent.DefaultPromise.notifyListenersNow(DefaultPromise.java:474)
	at io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:413)
	at io.netty.util.concurrent.DefaultPromise.setValue0(DefaultPromise.java:538)
	at io.netty.util.concurrent.DefaultPromise.setFailure0(DefaultPromise.java:531)
	at io.netty.util.concurrent.DefaultPromise.setFailure(DefaultPromise.java:103)
	at io.netty.resolver.InetSocketAddressResolver$1.operationComplete(InetSocketAddressResolver.java:64)
	at io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:500)
	at io.netty.util.concurrent.DefaultPromise.notifyListeners0(DefaultPromise.java:493)
	at io.netty.util.concurrent.DefaultPromise.notifyListenersNow(DefaultPromise.java:472)
	at io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:413)
	at io.netty.util.concurrent.DefaultPromise.setValue0(DefaultPromise.java:538)
	at io.netty.util.concurrent.DefaultPromise.setFailure0(DefaultPromise.java:531)
	at io.netty.util.concurrent.DefaultPromise.tryFailure(DefaultPromise.java:111)
	at io.netty.resolver.dns.DnsNameResolver.tryFailure(DnsNameResolver.java:907)
	at io.netty.resolver.dns.DnsNameResolver.access$400(DnsNameResolver.java:91)
	at io.netty.resolver.dns.DnsNameResolver$4.operationComplete(DnsNameResolver.java:927)
	at io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:500)
	at io.netty.util.concurrent.DefaultPromise.notifyListenersNow(DefaultPromise.java:474)
	at io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:413)
	at io.netty.util.concurrent.DefaultPromise.setValue0(DefaultPromise.java:538)
	at io.netty.util.concurrent.DefaultPromise.setFailure0(DefaultPromise.java:531)
	at io.netty.util.concurrent.DefaultPromise.tryFailure(DefaultPromise.java:111)
	at io.netty.resolver.dns.DnsResolveContext.finishResolve(DnsResolveContext.java:933)
	at io.netty.resolver.dns.DnsResolveContext.tryToFinishResolve(DnsResolveContext.java:884)
	at io.netty.resolver.dns.DnsResolveContext.query(DnsResolveContext.java:356)
	at io.netty.resolver.dns.DnsResolveContext.onResponse(DnsResolveContext.java:543)
	at io.netty.resolver.dns.DnsResolveContext.access$400(DnsResolveContext.java:64)
	at io.netty.resolver.dns.DnsResolveContext$2.operationComplete(DnsResolveContext.java:400)
	at io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:500)
	at io.netty.util.concurrent.DefaultPromise.notifyListeners0(DefaultPromise.java:493)
	at io.netty.util.concurrent.DefaultPromise.notifyListenersNow(DefaultPromise.java:472)
	at io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:413)
	at io.netty.util.concurrent.DefaultPromise.setValue0(DefaultPromise.java:538)
	at io.netty.util.concurrent.DefaultPromise.setSuccess0(DefaultPromise.java:527)
	at io.netty.util.concurrent.DefaultPromise.trySuccess(DefaultPromise.java:98)
	at io.netty.resolver.dns.DnsQueryContext.setSuccess(DnsQueryContext.java:204)
	at io.netty.resolver.dns.DnsQueryContext.finish(DnsQueryContext.java:196)
	at io.netty.resolver.dns.DnsNameResolver$DnsResponseHandler.channelRead(DnsNameResolver.java:1296)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:352)
	at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:102)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:352)
	at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1421)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360)
	at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:930)
	at io.netty.channel.nio.AbstractNioMessageChannel$NioMessageUnsafe.read(AbstractNioMessageChannel.java:93)
	at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:697)
	at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:632)
	at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:549)
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:511)
	at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:918)
	at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
	at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
	at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: java.net.UnknownHostException: failed to resolve 'macbook-pro-7.local' after 3 queries 
	at io.netty.resolver.dns.DnsResolveContext.finishResolve(DnsResolveContext.java:925)
	... 35 more