Merge pull request #2519 from FOCONIS/db2/fix-default-values

DB2: Fix default values for auto generated ids

ebean-core/src/main/java/io/ebeaninternal/server/persist/dml/InsertMeta.java

@@ -181,6 +181,8 @@ final class InsertMeta {
       case MARIADB:
       case ORACLE:
         return " values (default)";
+      case DB2:
+        return " (" + id.getIdentityColumn() + ") values (default)";
       default:
         return " default values";
     }