Updating based on code review

run

@@ -22,7 +22,7 @@ fi
 # values for that; it doesn't need a lot
 if [ "$1" = "spark.deploy.master.Master" -o "$1" = "spark.deploy.worker.Worker" ]; then
   SPARK_MEM=${SPARK_DAEMON_MEMORY:-512m}
-  SPARK_DAEMON_JAVA_OPTS+="-Dspark.akka.logLifecycleEvents=true"
+  SPARK_DAEMON_JAVA_OPTS+=" -Dspark.akka.logLifecycleEvents=true"
   SPARK_JAVA_OPTS=$SPARK_DAEMON_JAVA_OPTS   # Empty by default
 fi