Remove user_relns() SRF from regression tests.

The output of the function changes whenever previous (or, as in this
case, concurrent) tests leave a table in place. That causes unneeded
churn.

This should fix failures due to the tests added bfe16d1a5, like on
lapwing, caused by the tsrf test running concurrently with misc. Those
could also have been addressed by using temp tables, but that test has
annoyed me before.

Discussion: <27626.1473729905@sss.pgh.pa.us>

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
- 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
- mvtest_bb
- mvtest_t
- mvtest_tm
- mvtest_tmm
- mvtest_tv
- mvtest_tvm
- mvtest_tvmm
- mvtest_tvv
- mvtest_tvvm
- mvtest_tvvmv
- 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
- 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
- toyemp
- varchar_tbl
- xacttest
-(132 rows)
-
 SELECT name(equipment(hobby_construct(text 'skywalking', text 'mer')));
  name 
 ------