HDFS-16235. Fix Deadlock in LeaseRenewer for static remove method (#3472)

(cherry picked from commit 5f9321a5d4112e7b4ee9e6b948ce46a2b152a2db)
(cherry picked from commit 1df3b3de463332b688299078a59265ce405af6ac)

hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/client/impl/LeaseRenewer.java

@@ -96,7 +96,9 @@ public class LeaseRenewer {
    * @param renewer Instance to be cleared from Factory
    */
   public static void remove(LeaseRenewer renewer) {
-    Factory.INSTANCE.remove(renewer);
+    synchronized (renewer) {
+      Factory.INSTANCE.remove(renewer);
+    }
   }
 
   /**