autoupgrade support
small refactoring - share the common code

between the standard and Autoyast client
removed duplicate cache

available addons are already cached in Addon class
rename parameter enable_updates to disable_updates

to follow the logic
added tests (registration_ui_test.rb)
changes
improve code (code review fixes)
added FIXME note
Merge pull request #156 from yast/autoupgrade

Autoupgrade + small refactoring
ignore SUSE Manager services in SLP discovery (bnc#894470)

- 3.1.114
improved test case
Merge pull request #158 from yast/ignore_suse_manager

Ignore SUSE Manager services in SLP discovery (bnc#894470)
do not log registration keys in the Autoyast client
do not log the old credentials password at upgrade
changes
code review fixes
Merge pull request #159 from yast/do_not_log_credentials

Do not log credentials/reg code (bnc#894670)
sort displayed addons (bnc#888567)