[Bug 797128] videoaggregator: Notify drained status of a videoaggregator pad

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=797128

--- Comment #10 from Seungha Yang <pudding8757 at gmail.com> ---
"pad-drained" signal seems to be enough, so I removed "drained" read only
property from last patch.

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