Refactoring: code cleanup
Dropped unused code in AddressDialog

Code related to "ADVANCED_MB" seems unused.
Refactoring: splitted address dialog definition
Set IpoIb default mode. Refactored setting default devmap.
Refactoring: split firewall widget initialization from AddressDialog
UI: added IPoIB mode selection. fate#315501
Updated testsuite
UI: Extended MTU items for IPoIB devices.
Various formatting and refactoring mainly in AddressDialog
Updated changelog
Translator notes
Merge pull request #152 from mchf/fate315501-ipoib-mode-configuration

ipoib mode configuration