Remove redundant 'public' modifiers

CheckStyle reports 'public' being redundant on the constructor of
ApproveOption#Handler, but removing it causes test failures due to
org.kohsuke.args4j.Option requiring an explicitly public constructor.

Add a suppression for that one, and remove the 'public' in other
places where it's reported.

Change-Id: Ifbcf279ffa783d33b81efc1c675f468c3ea39135

gerrit-server/src/main/java/com/google/gerrit/server/change/PutTopic.java

@@ -90,7 +90,7 @@ public class PutTopic implements RestModifyView<ChangeResource, Input>,
     private String oldTopicName;
     private String newTopicName;
 
-    public Op(Input input) {
+    Op(Input input) {
       this.input = input;
     }