Tests: added command line arguments parsing in tests.

Added the following command line arguments:

  -d, --detailed: Show detailed output for tests

    Usage examples:

    ./test/run.py --detailed
    python3 test/test_access_log.py --detailed
    python3 test/test_access_log.py -d TestUnitAccessLog.test_access_log_ipv6


  -l, --log: Save unit.log after the test execution

    Usage examples:

    ./test/run.py -l
    python3 test/test_access_log.py -l
    python3 test/test_access_log.py --log TestUnitAccessLog.test_access_log_ipv6

test/test_configuration.py

@@ -218,4 +218,4 @@ class TestUnitConfiguration(unit.TestUnitControl):
         }), 'no port')
 
 if __name__ == '__main__':
-    unittest.main()
+    TestUnitConfiguration.main()