YARN-10347. Fix double locking in CapacityScheduler#reinitialize in branch-3.1.

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/capacity/CapacityScheduler.java

@@ -434,7 +434,6 @@ public class CapacityScheduler extends
          boolean validation) throws IOException {
     writeLock.lock();
     try {
-      writeLock.lock();
       Configuration configuration = new Configuration(newConf);
       CapacitySchedulerConfiguration oldConf = this.conf;
       if (validation) {