Tests: fixed http_resolver_ipv4.t with parallel tests.

Broken in 1786f49cca17.

Author: pluknet

http_resolver_ipv4.t

@@ -80,9 +80,11 @@ $t->waitforfile($t->testdir . '/' . port(8980));
 
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-is(get('/'), '127.0.0.1:8081, [::1]:8081', 'ipv4 ipv6');
-is(get('/ipv4'), '127.0.0.1:8081', 'ipv4 only');
-is(get('/ipv6'), '[::1]:8081', 'ipv6 only');
+my $p1 = port(8081);
+
+is(get('/'), "127.0.0.1:$p1, [::1]:$p1", 'ipv4 ipv6');
+is(get('/ipv4'), "127.0.0.1:$p1", 'ipv4 only');
+is(get('/ipv6'), "[::1]:$p1", 'ipv6 only');
 
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