Trouble running regression tests

I got the following errors when trying to run the regression tests in PG11:

```
*** /home/hadi/projects/test-cluster/cstore_fdw/expected/load.out 2018-12-13 22:13:48.273072679 -0500
--- /home/hadi/projects/test-cluster/cstore_fdw/results/load.out 2018-12-13 22:13:48.709069351 -0500
***************
*** 5,10 ****
--- 5,11 ----
COPY contestant FROM '/home/hadi/projects/test-cluster/cstore_fdw/data/contestants.1.csv'
WITH DELIMITER '|'; -- ERROR
ERROR: missing data for column "birthdate"
+ CONTEXT: COPY contestant, line 1: "a,1990-01-10,2090,97.1,XA ,{a}"
-- COPY with invalid program
COPY contestant FROM PROGRAM 'invalid_program' WITH CSV; -- ERROR
ERROR: program "invalid_program" failed

======================================================================

*** /home/hadi/projects/test-cluster/cstore_fdw/expected/drop.out 2018-12-12 21:54:05.667894921 -0500
--- /home/hadi/projects/test-cluster/cstore_fdw/results/drop.out 2018-12-13 22:13:49.441063765 -0500
***************
*** 92,97 ****
SELECT count(*) FROM pg_ls_dir('cstore_fdw') WHERE pg_ls_dir != :postgres_oid::text;
count
-------
! 1
(1 row)

--- 92,97 ----
SELECT count(*) FROM pg_ls_dir('cstore_fdw') WHERE pg_ls_dir != :postgres_oid::text;
count
-------
! 2
(1 row)

======================================================================

```