save the registration settings to autoinst.xml (bnc#892449)

at the end of installation
decrease vertical spacing in text mode (bnc#892747)

the main dialog did not fit 80x25 text screen
small refactoring in discover_registration_services.rb
small refactoring in local_server_dialog
small refactoring in import_certificate_dialog
changes
added comment
Merge pull request #150 from yast/clone

Fixed cloning at the end of installation (bnc#892449)