fix test 001_regress

- removed test atx0 from regression;
- removed the replacing of tables pg_publication and pg_subscription
with views, because some regression tests (object_address.sql) failed.
- add removing multimaster output lines from regression.diff by pattern
'mtm_sub_'. These lines contain floating port numbers, which prevents
the comparison of diff files.
- update regression_ee.diff

Tags: Multimaster

Author: Mikhail Rutman