add a step to enable forward extensions
add a step to set a user's dialaction
add a step to set a user's ringing time
add a scenario to test that the no answer dialaction is always working

when the forward on no answer extension is disabled it should still be possible
to use the user's dialaction on no answer (No answer tab in the user configuration)
add a scenario to the that the busy dialaction always works

even if the forward busy extension is disabled, an administrator should
be able to enable a user's forward on busy dialaction
reuse form helpers from xivo_lettuce