[py] Adding more diagnostics to understand why python tests cannot connect to selenium server on travis

Author: barancev

py/conftest.py

@@ -198,7 +198,8 @@ def wait_for_server(url, timeout):
             try:
                 urlopen(url)
                 return 1
-            except IOError:
+            except IOError as e:
+                print(e)
                 time.sleep(0.2)
         return 0