Add project setting for defaulting new changes to WIP

Feature: Issue 8866
Change-Id: I67b144eb3edfb596cfcfb545b273599d82cc04b1

gerrit-gwtui/src/main/java/com/google/gerrit/client/admin/AdminConstants.java

@@ -79,6 +79,8 @@ public interface AdminConstants extends Constants {
 
   String privateByDefault();
 
+  String workInProgressByDefault();
+
   String enableReviewerByEmail();
 
   String matchAuthorToCommitterDate();