[Bug 787367] parsebin: Emit 'drained' only for the top-level chain

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=787367

--- Comment #1 from Edward Hervey <bilboed at bilboed.com> ---
Created attachment 359276
  --> https://bugzilla.gnome.org/attachment.cgi?id=359276&action=edit
parsebin: Emit 'drained' only for the top-level chain

Instead of emitting 'drained' whenever every single chain is drained
(which would result in plenty of signal emission, and would also
occur when switching groups), only emit it when the top-level chain
is drained.

Furthermore, mark unknown (and therefore unexposed) pads as drained
since we'll never get EOS on them.

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