pgsql: Adjust parallel_schedule with event triggers on authenticated lo

Adjust parallel_schedule with event triggers on authenticated login

Event triggers on authenticated login could catch the connection of the
concurrent test.  In order to prevent this side effect we need to run
the event_trigger test alone.

Discussion: https://postgr.es/m/flat/CAMEv5_sS5G7K1PCV2oBx5+1NF1ZneJ6C5Z_xV_SWsZMukdFZiA@mail.gmail.com
Author: Mikhail A. Gribkov
Reviewed-by: Aleksander Alekseev

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/83510534d5f3f116efa035639b9b62b8c6c4df34

Modified Files
--------------
src/test/regress/parallel_schedule | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)