Format PL/Python module contents test vertically

It makes it readable again and makes merges more manageable.

src/pl/plpython/expected/plpython_test.out

@@ -36,17 +36,34 @@ select "Argument test #1"(users, fname, lname) from users where lname = 'doe' or
 (3 rows)
 
 -- check module contents
-CREATE FUNCTION module_contents() RETURNS text AS
+CREATE FUNCTION module_contents() RETURNS SETOF text AS
 $$
 contents = list(filter(lambda x: not x.startswith("__"), dir(plpy)))
 contents.sort()
-return ", ".join(contents)
+return contents
 $$ LANGUAGE plpythonu;
 select module_contents();
  module_contents 
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
- Error, Fatal, SPIError, cursor, debug, error, execute, fatal, info, log, notice, prepare, quote_ident, quote_literal, quote_nullable, spiexceptions, subtransaction, warning
-(1 row)
+-----------------
+ Error
+ Fatal
+ SPIError
+ cursor
+ debug
+ error
+ execute
+ fatal
+ info
+ log
+ notice
+ prepare
+ quote_ident
+ quote_literal
+ quote_nullable
+ spiexceptions
+ subtransaction
+ warning
+(18 rows)
 
 CREATE FUNCTION elog_test_basic() RETURNS void
 AS $$

src/pl/plpython/sql/plpython_test.sql

@@ -27,11 +27,11 @@ select "Argument test #1"(users, fname, lname) from users where lname = 'doe' or
 
 
 -- check module contents
-CREATE FUNCTION module_contents() RETURNS text AS
+CREATE FUNCTION module_contents() RETURNS SETOF text AS
 $$
 contents = list(filter(lambda x: not x.startswith("__"), dir(plpy)))
 contents.sort()
-return ", ".join(contents)
+return contents
 $$ LANGUAGE plpythonu;
 
 select module_contents();