changes Config class in network to only raise exceptions

The Config class should not call fail_json but simply raise exceptions
and allow the implementor to handle the exception

lib/ansible/module_utils/network.py

@@ -116,11 +116,6 @@ class Config(object):
         except AttributeError:
             exc = get_exception()
             raise NetworkError('undefined method "%s"' % method.__name__, exc=str(exc))
-        except NetworkError:
-            if raise_exc:
-                raise
-            exc = get_exception()
-            self.fail_json(msg=exc.message, **exc.kwargs)
         except NotImplementedError:
             raise NetworkError('method not supported "%s"' % method.__name__)