Fix ignore of direct table test files.

This is introduced by direct table commits, each time run regress
test will get files as below.

Untracked files:
  (use "git add <file>..." to include in what will be committed)
        expected/directory_table.out
        expected/directory_table_optimizer.out
        sql/directory_table.sql

Authored-by: Zhang Mingli avamingli@gmail.com

src/test/regress/expected/.gitignore

@@ -59,3 +59,5 @@
 /external_table_persistent_error_log.out
 /external_table_union_all.out
 /external_table_union_all_optimizer.out
+/directory_table.out
+/directory_table_optimizer.out

src/test/regress/sql/.gitignore

@@ -57,3 +57,4 @@
 /workfile_mgr_test.sql
 /external_table_persistent_error_log.sql
 /external_table_union_all.sql
+/directory_table.sql