pgsql: Fix the timestamptz test problem, by moving the tests that use

Log Message:
-----------
Fix the timestamptz test problem, by moving the tests that use the
timestamp_tbl table into the timestamp test.  Also, restore a test that
used to exist as a valid test in the timestamptz test.

Modified Files:
--------------
    pgsql/src/test/regress/expected:
        timestamp.out (r1.33 -> r1.34)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/timestamp.out.diff?r1=1.33&r2=1.34)
        timestamptz.out (r1.23 -> r1.24)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/timestamptz.out.diff?r1=1.23&r2=1.24)
    pgsql/src/test/regress/sql:
        timestamp.sql (r1.18 -> r1.19)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/sql/timestamp.sql.diff?r1=1.18&r2=1.19)
        timestamptz.sql (r1.11 -> r1.12)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/sql/timestamptz.sql.diff?r1=1.11&r2=1.12)