Upgrade to Atomix 3.1.0-beta2

Change-Id: I8a4f6942645cc0abe37a09c27eec835afc29fd5d
diff --git a/tools/test/bin/atomix-push-bits b/tools/test/bin/atomix-push-bits
index 58671dc..ba35c10 100755
--- a/tools/test/bin/atomix-push-bits
+++ b/tools/test/bin/atomix-push-bits
@@ -26,7 +26,7 @@
 
 . $ONOS_ROOT/tools/build/envDefaults
 
-ATOMIX_VERSION=${ATOMIX_VERSION:-3.1.0-beta1}
+ATOMIX_VERSION=${ATOMIX_VERSION:-3.1.0-beta2}
 ATOMIX_MAVEN=~/.m2/repository/io/atomix/atomix-dist/$ATOMIX_VERSION/atomix-dist-$ATOMIX_VERSION.tar.gz
 ATOMIX_LOCAL=/tmp/atomix-$ATOMIX_VERSION.tar.gz
 ATOMIX_REMOTE=https://oss.sonatype.org/content/repositories/releases/io/atomix/atomix-dist/$ATOMIX_VERSION/atomix-dist-$ATOMIX_VERSION.tar.gz