Pushed the cache increment into the shared code that persists notifications.

Much simpler implementation, inc code removed from tasks and V1/V2 rest clients.

app/clients/redis/__init__.py

@@ -1,5 +1,5 @@
 from datetime import datetime
 
 
-def cache_key(service_id):
+def daily_limit_cache_key(service_id):
     return "{}-{}-{}".format(str(service_id), datetime.utcnow().strftime("%Y-%m-%d"), "count")