Clear the firmware poll retry budget after a good poll

The counter is there to ride out a few unanswered progress polls, but
nothing ever cleared it, so three failures spread across a long apply
exhausted it and aborted an update that was still making progress.

confluent_server/aiohmi/ipmi/oem/lenovo/nextscale.py

@@ -1036,6 +1036,7 @@ class SMMClient(object):
                         raise
                     tries += 1
                     continue
+                tries = 0
                 if status != 200:
                     raise Exception('Error applying firmware')
                 progdata = fromstring(progdata)