Fix up huge numbers of pylint warnings

Change-Id: I9112ab123943a81e60d2c6bf096bc125e8e042b7
diff --git a/db/db.py b/db/db.py
index 2c6d089..6532bb1 100644
--- a/db/db.py
+++ b/db/db.py
@@ -36,7 +36,7 @@
             self.connection = psycopg2.connect(database=db_name, user=username)
             self.cursor = self.connection.cursor(cursor_factory=psycopg2.extras.NamedTupleCursor)
         except Exception as e:
-            logging.error("Failed to access database: %s" % e)
+            logging.error("Failed to access database: %s", e)
             raise
 
     def __del__(self):