pgsql: Use a longer connection timeout in pg_isready test.

Use a longer connection timeout in pg_isready test.

Buildfarm members skink and sungazer have both recently failed this
test, with symptoms indicating that the default 3-second timeout
isn't quite enough for those very slow systems. There's no reason
to be miserly with this timeout, so boost it to 60 seconds.

Back-patch to all versions containing this test. That may be overkill,
because the failure has only been observed in the v10 branch, but
I don't feel like having to revisit this later.

Branch
------
REL9_4_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/45ec8da100a1adcbc792025db59d3009d78da02d

Modified Files
--------------
src/bin/scripts/t/080_pg_isready.pl | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)