[Bug 785951] urisourcebin/decodebin3: Don't use custom EOS events

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=785951

--- Comment #2 from Edward Hervey <bilboed at bilboed.com> ---
Created attachment 357276
  --> https://bugzilla.gnome.org/attachment.cgi?id=357276&action=edit
decodebin3/urisourcebin: Switch to actual EOS events internally

Use the intended sequence for re-using elements:
* EOS
* STREAM_START if element is to be re-used

This avoids having elements (such as queue/multiqueue/queue2) not
properly resetting themselves.

When delaying EOS propagation (because we want to wait until all
streams of a group are done for example), we re-trigger them by
first sending the cached STREAM_START and then EOS (which will
cause elements to re-set themselves if needed and accept new
buffers/events).

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