Increasing timeout of poll_query_until for TAP tests

Hi all,

Lately hamster is failing every 4/5 days on the recovery regression
tests in 003 covering the recovery targets, with that:
# Postmaster PID for node "standby_2" is 20510
#
Timed out while waiting for standby to catch up at
t/003_recovery_targets.pl line 36.

Which means that poll_for_query timed out for the standby to catch up..

Here is an example of test that failed:
http://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=hamster&dt=2016-07-24%2016%3A00%3A07

This buildfarm machine is legendary known for its slowness, and I
don't see a better answer to that than increasing the max timeout of
poll_query_until to put that back to green.
Thoughts?
-- 
Michael