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

Cr-Mirrored-From: https://chromium.googlesource.com/external/github.com/SeleniumHQ/selenium
Cr-Mirrored-Commit: 1881111f3103d7e61943705c92f94dbb7d64b6d0
diff --git a/conftest.py b/conftest.py
index ec89ada..b6882cd 100644
--- a/conftest.py
+++ b/conftest.py
@@ -198,7 +198,8 @@
             try:
                 urlopen(url)
                 return 1
-            except IOError:
+            except IOError as e:
+                print(e)
                 time.sleep(0.2)
         return 0