Miscellaneous pylint fixes.

The following rules are no longer disabled:

- bad-format-string
- duplicate-key
- lost-exception
- trailing-newlines
- unexpected-keyword-arg
- useless-suppression
- using-constant-test

lib/ansible/plugins/lookup/etcd.py

@@ -139,7 +139,6 @@ class Etcd:
                 value = "ENOENT"
         except:
             raise
-            pass
 
         return value