Convert the existing regression test scripts for the various optional

PLs to use the standard pg_regress infrastructure.  No changes in the
tests themselves.  Andrew Dunstan

src/pl/plpython/expected/plpython_test.out

@@ -0,0 +1,184 @@
+-- first some tests of basic functionality
+--
+-- better succeed
+--
+select stupid();
+ stupid 
+--------
+ zarkon
+(1 row)
+
+-- check static and global data
+--
+SELECT static_test();
+ static_test 
+-------------
+           1
+(1 row)
+
+SELECT static_test();
+ static_test 
+-------------
+           2
+(1 row)
+
+SELECT global_test_one();
+                    global_test_one                     
+--------------------------------------------------------
+ SD: set by global_test_one, GD: set by global_test_one
+(1 row)
+
+SELECT global_test_two();
+                    global_test_two                     
+--------------------------------------------------------
+ SD: set by global_test_two, GD: set by global_test_one
+(1 row)
+
+-- import python modules
+--
+SELECT import_fail();
+NOTICE:  ('import socket failed -- No module named foosocket',)
+    import_fail     
+--------------------
+ failed as expected
+(1 row)
+
+SELECT import_succeed();
+     import_succeed     
+------------------------
+ succeeded, as expected
+(1 row)
+
+-- test import and simple argument handling
+--
+SELECT import_test_one('sha hash of this string');
+             import_test_one              
+------------------------------------------
+ a04e23cb9b1a09cd1051a04a7c571aae0f90346c
+(1 row)
+
+-- test import and tuple argument handling
+--
+select import_test_two(users) from users where fname = 'willem';
+                          import_test_two                          
+-------------------------------------------------------------------
+ sha hash of willemdoe is 3cde6b574953b0ca937b4d76ebc40d534d910759
+(1 row)
+
+-- test multiple arguments
+--
+select argument_test_one(users, fname, lname) from users where lname = 'doe' order by 1;
+                           argument_test_one                           
+-----------------------------------------------------------------------
+ jane doe => {fname: jane, lname: doe, userid: 1, username: j_doe}
+ john doe => {fname: john, lname: doe, userid: 2, username: johnd}
+ willem doe => {fname: willem, lname: doe, userid: 3, username: w_doe}
+(3 rows)
+
+-- spi and nested calls
+--
+select nested_call_one('pass this along');
+                         nested_call_one                         
+-----------------------------------------------------------------
+ {'nested_call_two': "{'nested_call_three': 'pass this along'}"}
+(1 row)
+
+select spi_prepared_plan_test_one('doe');
+ spi_prepared_plan_test_one 
+----------------------------
+ there are 3 does
+(1 row)
+
+select spi_prepared_plan_test_one('smith');
+ spi_prepared_plan_test_one 
+----------------------------
+ there are 1 smiths
+(1 row)
+
+select spi_prepared_plan_test_nested('smith');
+ spi_prepared_plan_test_nested 
+-------------------------------
+ there are 1 smiths
+(1 row)
+
+-- quick peek at the table
+--
+SELECT * FROM users;
+ fname  | lname | username | userid 
+--------+-------+----------+--------
+ jane   | doe   | j_doe    |      1
+ john   | doe   | johnd    |      2
+ willem | doe   | w_doe    |      3
+ rick   | smith | slash    |      4
+(4 rows)
+
+-- should fail
+--
+UPDATE users SET fname = 'william' WHERE fname = 'willem';
+-- should modify william to willem and create username
+--
+INSERT INTO users (fname, lname) VALUES ('william', 'smith');
+INSERT INTO users (fname, lname, username) VALUES ('charles', 'darwin', 'beagle');
+SELECT * FROM users;
+  fname  | lname  | username | userid 
+---------+--------+----------+--------
+ jane    | doe    | j_doe    |      1
+ john    | doe    | johnd    |      2
+ willem  | doe    | w_doe    |      3
+ rick    | smith  | slash    |      4
+ willem  | smith  | w_smith  |      5
+ charles | darwin | beagle   |      6
+(6 rows)
+
+SELECT join_sequences(sequences) FROM sequences;
+ join_sequences 
+----------------
+ ABCDEFGHIJKL
+ ABCDEF
+ ABCDEF
+ ABCDEF
+ ABCDEF
+ ABCDEF
+(6 rows)
+
+SELECT join_sequences(sequences) FROM sequences
+	WHERE join_sequences(sequences) ~* '^A';
+ join_sequences 
+----------------
+ ABCDEFGHIJKL
+ ABCDEF
+ ABCDEF
+ ABCDEF
+ ABCDEF
+ ABCDEF
+(6 rows)
+
+SELECT join_sequences(sequences) FROM sequences
+	WHERE join_sequences(sequences) ~* '^B';
+ join_sequences 
+----------------
+(0 rows)
+
+-- error in trigger
+--
+--
+-- Check Universal Newline Support
+--
+SELECT newline_lf();
+ newline_lf 
+------------
+        123
+(1 row)
+
+SELECT newline_cr();
+ newline_cr 
+------------
+        123
+(1 row)
+
+SELECT newline_crlf();
+ newline_crlf 
+--------------
+          123
+(1 row)
+