Fix pg_dump to dump serial columns as serials. Per pghackers discussion,

cause SERIAL column declaration not to imply UNIQUE, so that this can be
done without creating an extra index.

src/test/regress/expected/copy2.out

@@ -6,7 +6,6 @@ CREATE TABLE x (
 	e text
 );
 NOTICE:  CREATE TABLE will create implicit sequence 'x_a_seq' for SERIAL column 'x.a'
-NOTICE:  CREATE TABLE / UNIQUE will create implicit index 'x_a_key' for table 'x'
 CREATE FUNCTION fn_x_before () RETURNS OPAQUE AS '
   BEGIN
 		NEW.e := ''before trigger fired''::text;

src/test/regress/expected/create_misc.out

@@ -137,7 +137,6 @@ INSERT INTO iportaltest (i, d, p)
 ---
 CREATE TABLE serialTest (f1 text, f2 serial);
 NOTICE:  CREATE TABLE will create implicit sequence 'serialtest_f2_seq' for SERIAL column 'serialtest.f2'
-NOTICE:  CREATE TABLE / UNIQUE will create implicit index 'serialtest_f2_key' for table 'serialtest'
 INSERT INTO serialTest VALUES ('foo');
 INSERT INTO serialTest VALUES ('bar');
 INSERT INTO serialTest VALUES ('force', 100);

src/test/regress/expected/sanity_check.out

@@ -59,11 +59,10 @@ SELECT relname, relhasindex
  pg_trigger          | t
  pg_type             | t
  road                | t
- serialtest          | t
  shighway            | t
  tenk1               | t
  tenk2               | t
-(53 rows)
+(52 rows)
 
 --
 -- another sanity check: every system catalog that has OIDs should have