Tests: options moved to the separate class.

This change is necessary to separate the logic
and prevent possible circular dependency.

test/test_proxy_chunked.py

@@ -3,10 +3,10 @@ import select
 import socket
 import time
 
-from conftest import option
 from conftest import run_process
 from conftest import waitforsocket
 from unit.applications.lang.python import TestApplicationPython
+from unit.option import option
 
 
 class TestProxyChunked(TestApplicationPython):