Reformat POL to standardized format

Change-Id: I955a76830f582b6d152e242568d74a12907c782c
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>
diff --git a/osm_policy_module/migrations/conf.py b/osm_policy_module/migrations/conf.py
index c86cad9..70d39f8 100644
--- a/osm_policy_module/migrations/conf.py
+++ b/osm_policy_module/migrations/conf.py
@@ -23,4 +23,4 @@
 ##
 import os
 
-DATABASE = os.getenv('OSMPOL_SQL_DATABASE_URI', 'sqlite:///policy_module.db')
+DATABASE = os.getenv("OSMPOL_SQL_DATABASE_URI", "sqlite:///policy_module.db")