Give recovery tests more time to finish

These tests are currently only running in buildfarm member hamster,
which is purposefully very slow.  This suite has failed a couple of
times recently because of timeouts, so increase the allowed number of
iterations to avoid spurious failures.

Author: Michaël Paquier

src/test/perl/PostgresNode.pm

@@ -1192,7 +1192,7 @@ sub poll_query_until
 {
 	my ($self, $dbname, $query) = @_;
 
-	my $max_attempts = 90;
+	my $max_attempts = 180;
 	my $attempts     = 0;
 	my ($stdout, $stderr);