[Bug 758257] adaptivedemux: don't expose pads until caps are known

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=758257

--- Comment #12 from Seungha Yang <sh.yang at lge.com> ---
Created attachment 343079
  --> https://bugzilla.gnome.org/attachment.cgi?id=343079&action=edit
adaptivedemux: Block prerolling pads until exposed

In download thread, event/buffer can be pushed before
the corresponding pad is exposed.
To ensure sequence, stream's srcpads will be blocked
until exposing newpads and removing oldpads are finished.

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