moved commons-pool to root pom.xml

Change-Id: Ic366fd4c790d6a9b9c43d6b593e034427eefa6a6

@@ -248,6 +248,11 @@
                 <classifier>tests</classifier>
                 <scope>test</scope>
             </dependency>
+            <dependency>
+              <groupId>commons-pool</groupId>
+              <artifactId>commons-pool</artifactId>
+              <version>1.6</version>
+            </dependency>
         </dependencies>
     </dependencyManagement>
 

@@ -42,7 +42,6 @@
         <dependency>
             <groupId>commons-pool</groupId>
             <artifactId>commons-pool</artifactId>
-            <version>1.6</version>
         </dependency>
     </dependencies>