Use signal for handling ChannelPending in test_background_event_handling #2165
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This fixes two potential panics within the test if the
BackgroundProcessorfornodes[0]consumed theChannelPendingevent prior to us consuming it manually inend_open_channel. The first panic would happen within the event handler, sinceChannelPendingwas not being handled. The second panic would happen upon expecting theChannelPendingevent after handlingnodes[1]'sfunding_signedif theBackgroundProcessorhandled the event first. To ensure we still reliably receive aChannelPendingevent once possible, we let theBackgroundProcessorconsume the event and notify it.Fixes #2144.