Allow extra group suggestions for project owners.

The suggestGroupOwner currently only returns groups that are visible
to the user.  When editing a project config, include the
Project.NameKey so owners can be shown and add groups to which they
are not a member.

Change-Id: I1df4a025b6e11e92a44e77e2e96e16f4e187f1a1

gerrit-server/src/main/java/com/google/gerrit/server/auth/ldap/LdapGroupBackend.java

@@ -144,7 +144,7 @@ public class LdapGroupBackend implements GroupBackend {
 
       @Override
       public boolean isVisibleToAll() {
-        return true;
+        return false;
       }
     };
   }