Investigate Netty's "Too many open files" exception in testing of infinispan-compatibility-mode-it

mci -rf :infinispan-compatibility-mode-it

Failed tests: 
  ByteArrayKeyDistEmbeddedHotRodTest.setup:27 » IllegalState failed to create a ...
  ByteArrayKeyReplEmbeddedHotRodTest.setup:87 » IllegalState failed to create a ...
  ByteArrayValueDistEmbeddedHotRodTest.setup:27 » IllegalState failed to create ...
  ByteArrayValueReplEmbeddedHotRodTest.setup:87 » IllegalState failed to create ...
  DistEmbeddedRestHotRodTest.setup:25 » IllegalState failed to create a child ev...
  DistL1EmbeddedHotRodTest.setup:30 » IllegalState failed to create a child even...
  DistMemcachedEmbeddedTest.setup:39 » IllegalState failed to create a child eve...
org.infinispan.it.compatibility.EmbeddedHotRodCacheListenerTest.setup(org.infinispan.it.compatibility.EmbeddedHotRodCacheListenerTest)
  Run 1: EmbeddedHotRodCacheListenerTest.setup:36 » IllegalState failed to create a chi...
  Run 2: PASS
  Run 3: PASS

  EmbeddedHotRodTest.testEventFilteringStatic:274->lambda$testEventFilteringStatic$4:276 » Transport
  EmbeddedMemcachedCacheListenerTest.setup:39 » IllegalState failed to create a ...
  EmbeddedRestMemcachedHotRodTest.setup:50 » IllegalState failed to create a chi...
  ReplEmbeddedRestHotRodTest.setup:38 » IllegalState failed to create a child ev...

Tests run: 101, Failures: 12, Errors: 0, Skipped: 47

java.lang.IllegalStateException: failed to create a child event loop
	at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:88)
	at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:58)
	at io.netty.channel.MultithreadEventLoopGroup.<init>(MultithreadEventLoopGroup.java:51)
	at io.netty.channel.nio.NioEventLoopGroup.<init>(NioEventLoopGroup.java:87)
	at io.netty.channel.nio.NioEventLoopGroup.<init>(NioEventLoopGroup.java:82)
	at io.netty.channel.nio.NioEventLoopGroup.<init>(NioEventLoopGroup.java:63)
	at io.netty.channel.nio.NioEventLoopGroup.<init>(NioEventLoopGroup.java:51)
	at org.jboss.resteasy.plugins.server.netty.NettyJaxrsServer.start(NettyJaxrsServer.java:239)
	at org.infinispan.rest.NettyRestServer.start(NettyRestServer.java:81)
	at org.infinispan.it.compatibility.CompatibilityCacheFactory.createRestCache(CompatibilityCacheFactory.java:199)
	at org.infinispan.it.compatibility.CompatibilityCacheFactory.createRestMemcachedCaches(CompatibilityCacheFactory.java:137)
	at org.infinispan.it.compatibility.CompatibilityCacheFactory.setup(CompatibilityCacheFactory.java:123)
	at org.infinispan.it.compatibility.DistMemcachedEmbeddedTest.setup(DistMemcachedEmbeddedTest.java:39)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:84)
	at org.testng.internal.Invoker.invokeConfigurationMethod(Invoker.java:564)
	at org.testng.internal.Invoker.invokeConfigurations(Invoker.java:213)
	at org.testng.internal.Invoker.invokeConfigurations(Invoker.java:138)
	at org.testng.internal.TestMethodWorker.invokeBeforeClassMethods(TestMethodWorker.java:175)
	at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:107)
	at org.testng.TestRunner.privateRun(TestRunner.java:767)
	at org.testng.TestRunner.run(TestRunner.java:617)
	at org.testng.SuiteRunner.runTest(SuiteRunner.java:348)
	at org.testng.SuiteRunner.access$000(SuiteRunner.java:38)
	at org.testng.SuiteRunner$SuiteWorker.run(SuiteRunner.java:382)
	at org.testng.internal.thread.ThreadUtil$2.call(ThreadUtil.java:64)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)
Caused by: io.netty.channel.ChannelException: failed to open a new selector
	at io.netty.channel.nio.NioEventLoop.openSelector(NioEventLoop.java:157)
	at io.netty.channel.nio.NioEventLoop.<init>(NioEventLoop.java:148)
	at io.netty.channel.nio.NioEventLoopGroup.newChild(NioEventLoopGroup.java:126)
	at io.netty.channel.nio.NioEventLoopGroup.newChild(NioEventLoopGroup.java:36)
	at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:84)
	... 32 more
Caused by: java.io.IOException: Too many open files
	at sun.nio.ch.EPollArrayWrapper.epollCreate(Native Method)
	at sun.nio.ch.EPollArrayWrapper.<init>(EPollArrayWrapper.java:130)
	at sun.nio.ch.EPollSelectorImpl.<init>(EPollSelectorImpl.java:69)
	at sun.nio.ch.EPollSelectorProvider.openSelector(EPollSelectorProvider.java:36)
	at io.netty.channel.nio.NioEventLoop.openSelector(NioEventLoop.java:155)
	... 36 more