pgsql: tests: Don't fail due to high default timeout in postmaster/003_

tests: Don't fail due to high default timeout in postmaster/003_start_stop

Some BF animals use very high timeouts due to their slowness. Unfortunately
postmaster/003_start_stop fails if a high timeout is configured, due to
authentication_timeout having a fairly low max.

As this test is reasonably fast, the easiest fix seems to be to cap the
timeout to 600.

Per buildfarm animal skink.

Reviewed-by: Heikki Linnakangas <hlinnaka(at)iki(dot)fi>
Discussion: https://postgr.es/m/ggflhkciwdyotpoie323chu2c2idpjk5qimrn462encwx2io7s@thmcxl7i6dpw

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/b48832cddbf57a3428f1a553e395f1870e1b0cb5

Modified Files
--------------
src/test/postmaster/t/003_start_stop.pl | 4 ++++
1 file changed, 4 insertions(+)