Upgrade to netty 4.1.116.Final (#414)

Previous version has a bug causing an IOException during
reading of /etc/os-release. See netty's issue 14479 for details.

Author: Bouncheck

pom.xml

@@ -55,7 +55,7 @@
     <!-- when changing version also update version in LICENSE_binary  -->
     <hdrhistogram.version>2.1.12</hdrhistogram.version>
     <metrics.version>4.1.18</metrics.version>
-    <netty.version>4.1.115.Final</netty.version>
+    <netty.version>4.1.116.Final</netty.version>
     <esri.version>1.2.1</esri.version>
     <!--
     When upgrading TinkerPop please upgrade the version matrix in