Add system's requirements.txt, enforce flake8 linter

Fix style issues in functional tests.

system/t09_repo/__init__.py

@@ -1,17 +1,3 @@
 """
 Testing local repo management
 """
-
-from .add import *
-from .copy import *
-from .create import *
-from .drop import *
-from .edit import *
-from .cmdimport import *
-from .list import *
-from .move import *
-from .remove import *
-from .show import *
-from .rename import *
-from .search import *
-from .include import *