[Bug 779695] urisourcebin: Protect expose_output_pad() with lock

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=779695

--- Comment #3 from Seungha Yang <sh.yang at lge.com> ---
The commit of Bug#773131 moved source-group unlock point, and playbin3 might
wrongly connect the urisource's srcpad with decodebin3's sinkpad.
So, we need to protect urisourcebin's pad-added in somewhere.

So, I'd like to handle this in urisourcebin, since expose_output_pad() in
urisourcebin has been protected by lock in some other cases, but not
adaptivedemux usecase.

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