Stabilize recently-added information_schema test queries.

These queries could show unexpected entries if the core system,
or concurrently-running test scripts, created any functions that
would appear in the information_schema views.  Restrict them
to showing functions belonging to this test's schema, as the
far-older nearby test case does.

Per experimentation with conversion of some built-in functions
to SQL-function-body style.

src/test/regress/expected/create_function_3.out

@@ -475,26 +475,34 @@ SELECT r0.routine_name, r1.routine_name
   FROM information_schema.routine_routine_usage rru
        JOIN information_schema.routines r0 ON r0.specific_name = rru.specific_name
        JOIN information_schema.routines r1 ON r1.specific_name = rru.routine_name
+  WHERE r0.routine_schema = 'temp_func_test' AND
+        r1.routine_schema = 'temp_func_test'
   ORDER BY 1, 2;
   routine_name  |  routine_name  
 ----------------+----------------
  functest_is_4b | functest_is_4a
 (1 row)
 
-SELECT routine_name, sequence_name FROM information_schema.routine_sequence_usage ORDER BY 1, 2;
+SELECT routine_name, sequence_name FROM information_schema.routine_sequence_usage
+  WHERE routine_schema = 'temp_func_test'
+  ORDER BY 1, 2;
  routine_name  | sequence_name 
 ---------------+---------------
  functest_is_5 | functest1
  functest_is_6 | functest1
 (2 rows)
 
-SELECT routine_name, table_name, column_name FROM information_schema.routine_column_usage ORDER BY 1, 2;
+SELECT routine_name, table_name, column_name FROM information_schema.routine_column_usage
+  WHERE routine_schema = 'temp_func_test'
+  ORDER BY 1, 2;
  routine_name  | table_name | column_name 
 ---------------+------------+-------------
  functest_is_7 | functest2  | a
 (1 row)
 
-SELECT routine_name, table_name FROM information_schema.routine_table_usage ORDER BY 1, 2;
+SELECT routine_name, table_name FROM information_schema.routine_table_usage
+  WHERE routine_schema = 'temp_func_test'
+  ORDER BY 1, 2;
  routine_name  | table_name 
 ---------------+------------
  functest_is_7 | functest2

src/test/regress/sql/create_function_3.sql

@@ -277,10 +277,18 @@ SELECT r0.routine_name, r1.routine_name
   FROM information_schema.routine_routine_usage rru
        JOIN information_schema.routines r0 ON r0.specific_name = rru.specific_name
        JOIN information_schema.routines r1 ON r1.specific_name = rru.routine_name
+  WHERE r0.routine_schema = 'temp_func_test' AND
+        r1.routine_schema = 'temp_func_test'
+  ORDER BY 1, 2;
+SELECT routine_name, sequence_name FROM information_schema.routine_sequence_usage
+  WHERE routine_schema = 'temp_func_test'
+  ORDER BY 1, 2;
+SELECT routine_name, table_name, column_name FROM information_schema.routine_column_usage
+  WHERE routine_schema = 'temp_func_test'
+  ORDER BY 1, 2;
+SELECT routine_name, table_name FROM information_schema.routine_table_usage
+  WHERE routine_schema = 'temp_func_test'
   ORDER BY 1, 2;
-SELECT routine_name, sequence_name FROM information_schema.routine_sequence_usage ORDER BY 1, 2;
-SELECT routine_name, table_name, column_name FROM information_schema.routine_column_usage ORDER BY 1, 2;
-SELECT routine_name, table_name FROM information_schema.routine_table_usage ORDER BY 1, 2;
 
 DROP FUNCTION functest_IS_4a CASCADE;
 DROP SEQUENCE functest1 CASCADE;