wizard: Add skip button on conectivity test screen
In some network / on some device the connectivity test would not be able to finish. However there is only the link to close whole wizard and no noticeable timer for ending the test in such cases.
As a result I have never been able to finish wizard on any omnia (neither at home, neither on InstallFest 2017 workshop). Being it the first thing any omnia user would see and not being able to finish the initial setup makes in quite bad experience.