* A problem with default values treatment at superusers (and users) on the main menu
* Solving issues when changing the selection of nic, ask_to_configure_network failed in several places.
Solved, temporarily with the creation of __getitem__ and get methods at NetworkManager
* Accept old style definitions for nic
* flake8 complains
* log string corrected (issue 1039)
* Correct exit when no disk is selected and we don't wish to continue