Add Checkstyle ParenPad

Author: garydgregory

src/conf/checkstyle.xml

@@ -60,6 +60,7 @@ limitations under the License.
       <property name="scope" value="protected" />
     </module>
     <module name="NeedBraces" />
+    <module name="ParenPad" />
     <module name="RedundantImport" />
     <module name="TypecastParenPad" />    
     <module name="UnusedImports" />