Refactor to move logic from SQL functions to Python

- Moved the logic the retrieve the redis connection params to
  RedisDBConfig class
- Moved the logic that retrieve the services configuration to
  ServicesDBConfig

server/lib/python/cartodb_services/cartodb_services/metrics/log.py

@@ -1,4 +1,4 @@
-
+from datetime import datetime
 import abc
 import json
 import re