Remove user_relns() SRF from regression tests.

Back-patch commit 0dba54f166 into the older
branches.  This test is almost as much of a patching hazard there as it is
in HEAD, and it has no more reason to be needed than it does in HEAD.

I went back as far as 9.2; I judged 9.1 not worth the trouble since
it's on the verge of being EOL'd.

src/test/regress/input/create_function_2.source

@@ -62,15 +62,6 @@ CREATE FUNCTION equipment_named_ambiguous_2b(hobby text)
    LANGUAGE SQL;
 
 
-CREATE FUNCTION user_relns()
-   RETURNS setof name
-   AS 'select relname
-       from pg_class c, pg_namespace n
-       where relnamespace = n.oid and
-             (nspname !~ ''pg_.*'' and nspname <> ''information_schema'') and
-             relkind <> ''i'' '
-   LANGUAGE SQL;
-
 CREATE FUNCTION pt_in_widget(point, widget)
    RETURNS bool
    AS '@libdir@/regress@DLSUFFIX@'

src/test/regress/input/misc.source

@@ -218,9 +218,6 @@ SELECT (p.hobbies).equipment.name, name(p.hobbies), p.name FROM ONLY person p;
 
 SELECT name(equipment(p.hobbies)), name(p.hobbies), p.name FROM person* p;
 
-SELECT user_relns() AS user_relns
-   ORDER BY user_relns;
-
 SELECT name(equipment(hobby_construct(text 'skywalking', text 'mer')));
 
 SELECT name(equipment(hobby_construct_named(text 'skywalking', text 'mer')));

src/test/regress/output/create_function_2.source

@@ -47,14 +47,6 @@ CREATE FUNCTION equipment_named_ambiguous_2b(hobby text)
    RETURNS setof equipment_r
    AS 'select * from equipment_r where equipment_r.hobby = hobby'
    LANGUAGE SQL;
-CREATE FUNCTION user_relns()
-   RETURNS setof name
-   AS 'select relname
-       from pg_class c, pg_namespace n
-       where relnamespace = n.oid and
-             (nspname !~ ''pg_.*'' and nspname <> ''information_schema'') and
-             relkind <> ''i'' '
-   LANGUAGE SQL;
 CREATE FUNCTION pt_in_widget(point, widget)
    RETURNS bool
    AS '@libdir@/regress@DLSUFFIX@'

src/test/regress/output/misc.source

@@ -574,144 +574,6 @@ SELECT name(equipment(p.hobbies)), name(p.hobbies), p.name FROM person* p;
  peet's coffee | posthacking | jeff
 (6 rows)
 
-SELECT user_relns() AS user_relns
-   ORDER BY user_relns;
-     user_relns      
----------------------
- a
- a_star
- abstime_tbl
- aggtest
- aggtype
- array_index_op_test
- array_op_test
- arrtest
- b
- b_star
- bb
- box_tbl
- bprime
- brinopers
- brintest
- bt_f8_heap
- bt_i4_heap
- bt_name_heap
- bt_txt_heap
- btree_tall_tbl
- c
- c_star
- char_tbl
- check2_tbl
- check_seq
- check_tbl
- circle_tbl
- city
- copy_tbl
- d
- d_star
- date_tbl
- default_seq
- default_tbl
- defaultexpr_tbl
- dept
- dupindexcols
- e_star
- emp
- equipment_r
- f_star
- fast_emp4000
- float4_tbl
- float8_tbl
- func_index_heap
- gin_test_tbl
- gist_point_tbl
- hash_f8_heap
- hash_i4_heap
- hash_name_heap
- hash_txt_heap
- hobbies_r
- iexit
- ihighway
- inet_tbl
- inhf
- inhx
- insert_seq
- insert_tbl
- int2_tbl
- int4_tbl
- int8_tbl
- interval_tbl
- iportaltest
- kd_point_tbl
- line_tbl
- log_table
- lseg_tbl
- main_table
- money_data
- num_data
- num_exp_add
- num_exp_div
- num_exp_ln
- num_exp_log10
- num_exp_mul
- num_exp_power_10_ln
- num_exp_sqrt
- num_exp_sub
- num_input_test
- num_result
- onek
- onek2
- path_tbl
- person
- point_tbl
- polygon_tbl
- quad_point_tbl
- radix_text_tbl
- ramp
- random_tbl
- real_city
- reltime_tbl
- rls_tbl
- rls_tbl_force
- road
- shighway
- slow_emp4000
- spgist_point_tbl
- spgist_text_tbl
- street
- stud_emp
- student
- subselect_tbl
- t
- tenk1
- tenk2
- test_range_excl
- test_range_gist
- test_range_spgist
- test_tablesample
- test_tablesample_v1
- test_tablesample_v2
- test_tsvector
- testjsonb
- text_tbl
- time_tbl
- timestamp_tbl
- timestamptz_tbl
- timetz_tbl
- tinterval_tbl
- tm
- tmm
- toyemp
- tv
- tvm
- tvmm
- tvv
- tvvm
- tvvmv
- varchar_tbl
- xacttest
-(132 rows)
-
 SELECT name(equipment(hobby_construct(text 'skywalking', text 'mer')));
  name 
 ------