HADOOP-14903. Add json-smart explicitly to pom.xml. (rchiang)

hadoop-project/pom.xml

@@ -1206,6 +1206,15 @@
           </exclusion>
         </exclusions>
       </dependency>
+      <dependency>
+        <!-- HACK.  Transitive dependency for nimbus-jose-jwt.  Needed for
+             packaging.  Please re-check this version when updating
+             nimbus-jose-jwt.  Please read HADOOP-14903 for more details.
+          -->
+        <groupId>net.minidev</groupId>
+        <artifactId>json-smart</artifactId>
+        <version>2.3</version>
+      </dependency>
       <dependency>
         <groupId>org.skyscreamer</groupId>
         <artifactId>jsonassert</artifactId>