Raise retry count in eventhub tests

Hopefully, this'll help fix the CI

Author: elprans

tests/test_eventhub_functions.py

@@ -19,7 +19,7 @@ def test_eventhub_trigger(self):
         self.assertEqual(r.status_code, 200)
         self.assertEqual(r.text, 'OK')
 
-        max_retries = 10
+        max_retries = 30
 
         for try_no in range(max_retries):
             # Allow trigger to fire.