VOL-616 - update system test compose files to use non-swarm verison of fluentd

Change-Id: I1ded29119b7c13ad76ef0bb182e5fabe925ceda6
diff --git a/compose/docker-compose-system-test.yml b/compose/docker-compose-system-test.yml
index 99ffcd0..2582fb9 100644
--- a/compose/docker-compose-system-test.yml
+++ b/compose/docker-compose-system-test.yml
@@ -63,7 +63,7 @@
   # Fluentd log server
   #
   fluentd:
-    image: "${REGISTRY}${REPOSITORY}voltha-fluentd${TAG}"
+    image: "${REGISTRY}fluent/fluentd:v0.12.42"
     ports:
     - "24224:24224"
     volumes: