Set client encoding explicitly in plpython_unicode test

This will (hopefully) eliminate the need for the
plpython_unicode_0.out expected file.

src/pl/plpython/expected/README

@@ -2,8 +2,7 @@ Guide to alternative expected files:
 
 plpython_error_0.out			Python 2.4 and older
 
-plpython_unicode.out			server encoding != SQL_ASCII and client encoding == UTF8; else ...
-plpython_unicode_0.out			server encoding != SQL_ASCII and client encoding != UTF8; else ...
+plpython_unicode.out			server encoding != SQL_ASCII
 plpython_unicode_3.out			server encoding == SQL_ASCII
 
 plpython_subtransaction_0.out	Python 2.4 and older (without with statement)

src/pl/plpython/expected/plpython_unicode.out

 --
 -- Unicode handling
 --
+SET client_encoding TO UTF8;
 CREATE TABLE unicode_test (
 	testvalue  text NOT NULL
 );

src/pl/plpython/expected/plpython_unicode_0.out

---
--- Unicode handling
---
-CREATE TABLE unicode_test (
-	testvalue  text NOT NULL
-);
-CREATE FUNCTION unicode_return() RETURNS text AS E'
-return u"\\x80"
-' LANGUAGE plpythonu;
-CREATE FUNCTION unicode_trigger() RETURNS trigger AS E'
-TD["new"]["testvalue"] = u"\\x80"
-return "MODIFY"
-' LANGUAGE plpythonu;
-CREATE TRIGGER unicode_test_bi BEFORE INSERT ON unicode_test
-  FOR EACH ROW EXECUTE PROCEDURE unicode_trigger();
-CREATE FUNCTION unicode_plan1() RETURNS text AS E'
-plan = plpy.prepare("SELECT $1 AS testvalue", ["text"])
-rv = plpy.execute(plan, [u"\\x80"], 1)
-return rv[0]["testvalue"]
-' LANGUAGE plpythonu;
-CREATE FUNCTION unicode_plan2() RETURNS text AS E'
-plan = plpy.prepare("SELECT $1 || $2 AS testvalue", ["text", u"text"])
-rv = plpy.execute(plan, ["foo", "bar"], 1)
-return rv[0]["testvalue"]
-' LANGUAGE plpythonu;
-SELECT unicode_return();
- unicode_return 
-----------------
- 
-(1 row)
-
-INSERT INTO unicode_test (testvalue) VALUES ('test');
-SELECT * FROM unicode_test;
- testvalue 
------------
- 
-(1 row)
-
-SELECT unicode_plan1();
- unicode_plan1 
----------------
- 
-(1 row)
-
-SELECT unicode_plan2();
- unicode_plan2 
----------------
- foobar
-(1 row)
-

src/pl/plpython/expected/plpython_unicode_3.out

 --
 -- Unicode handling
 --
+SET client_encoding TO UTF8;
 CREATE TABLE unicode_test (
 	testvalue  text NOT NULL
 );

src/pl/plpython/sql/plpython_unicode.sql

@@ -2,6 +2,8 @@
 -- Unicode handling
 --
 
+SET client_encoding TO UTF8;
+
 CREATE TABLE unicode_test (
 	testvalue  text NOT NULL
 );