Fix and enable flake8 F823

F823 local variable 'blah' (defined in enclosing scope on line xx)
referenced before assignment

Change-Id: I721e1339ef023558032980bbf59e8dc44b391d52
Cell weighing class to handle mute child cells

Give negative weight to child cells that have not recently sent
capability or capacity updates to their parent cell.

Change-Id: I7cada3e1b6f04c48b71c82d8e0a8527e44674abd
Merge "Cell weighing class to handle mute child cells"
Merge "Fix and enable flake8 F823"