Tests: 8XXX used as default port range.

After the launch of the project, the testing infrastructure was shared with
nginx project in some cases.  To avoid port overlap, a decision was made
to shift the port range for Unit tests.  This problem was resolved a long time
ago and is no longer relevant, so it is now safe to use port 8XXX range as the
default, as it is more appropriate for testing purposes.

test/test_access_log.py

@@ -93,7 +93,7 @@ def test_access_log_ipv6(wait_for_record):
     load('empty')
 
     assert 'success' in client.conf(
-        {"[::1]:7080": {"pass": "applications/empty"}}, 'listeners'
+        {"[::1]:8080": {"pass": "applications/empty"}}, 'listeners'
     )
 
     client.get(sock_type='ipv6')