Add Checkstyle UnnecessaryParentheses

Author: garydgregory

src/conf/checkstyle.xml

@@ -75,6 +75,7 @@ limitations under the License.
     <module name="SuperClone" />
     <module name="SuperFinalize" />
     <module name="TypecastParenPad" />
+    <module name="UnnecessaryParentheses" />
     <module name="UnusedImports" />
     <module name="WhitespaceAfter" />
   </module>