Upgrade to Atomix 2.0.9
- Fix UnknownSessionExceptions
- Fix OutOfDirectMemoryErrors
- Ensure leader timeout is recurring
- Fix exceptions thrown during Raft startup communication
- Ensure sessions are only expired by leaders once

Change-Id: I856cb0840b3b609f5a3481567a4c367c8e6c9aae
diff --git a/features/features.xml b/features/features.xml
index 3155b4c..c594fda 100644
--- a/features/features.xml
+++ b/features/features.xml
@@ -59,7 +59,7 @@
         <bundle>mvn:com.typesafe/config/1.2.1</bundle>
         <bundle>mvn:com.googlecode.concurrent-trees/concurrent-trees/2.6.0</bundle>
         <bundle>mvn:commons-io/commons-io/2.4</bundle>
-        <bundle>mvn:io.atomix/atomix/2.0.8</bundle>
+        <bundle>mvn:io.atomix/atomix/2.0.9</bundle>
 
         <bundle>mvn:org.glassfish.jersey.core/jersey-client/2.25.1</bundle>