Geearl/7427 backoff error

[georearl]

AB#7420

This change fixes an error that occurs when a message sent to text enrichment is requeued, due to throttling for example. The code was this...

backoff = int(os.environ["ENRICHMENT_BACKOFF"])

def requeue(response, message_json):
'''This function handles requeing and erroring of cognitive servcies'''
blob_path = message_json["blob_name"]
queued_count = message_json["text_enrichment_queued_count"]
if response.status_code == 429:
# throttled, so requeue with random backoff seconds to mitigate throttling,
# unless it has hit the max tries
if queued_count < max_requeue_count:
max_seconds = backoff * (queued_count**2)
backoff = random.randint(
backoff * queued_count, max_seconds
)

The issue being that the global var backoff is being changed within a function, which gives an error. The fix was to use a different var name downstream rather than the same var. This is the same pattern in other functions