HADOOP-14648. Bump commons-configuration2 to 2.1.1. (rchiang)

hadoop-project/pom.xml

@@ -869,7 +869,7 @@
       <dependency>
         <groupId>org.apache.commons</groupId>
         <artifactId>commons-configuration2</artifactId>
-        <version>2.1</version>
+        <version>2.1.1</version>
         <exclusions>
           <exclusion>
             <groupId>org.apache.commons</groupId>