YARN-4593 Deadlock in AbstractService.getConfig() (stevel)

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/service/AbstractService.java

@@ -399,7 +399,7 @@ public abstract class AbstractService implements Service {
   }
 
   @Override
-  public synchronized Configuration getConfig() {
+  public Configuration getConfig() {
     return config;
   }