switching to modern python except with argument syntax

Author: robertpatrick

operator/src/test/python/test_wdt_mii_filter.py

@@ -415,7 +415,7 @@ def test_isSecureModeEnabledForDomain_importLegalHelperError(self):
 
       isSecureModeEnabled = model_wdt_mii_filter.isSecureModeEnabledForDomain(topology)
       self.fail("Expected import error for LegalHelper")
-    except ImportError, ie:
+    except ImportError as ie:
       self.assertTrue(ie is not None)