[Bug 722981] autodetect elements have inconsistent handling of autoplugin

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=722981
  GStreamer | gst-plugins-good | 1.x

--- Comment #2 from Stefan Sauer (gstreamer, gtkdoc dev) <ensonic at sonicpulse.de> 2014-02-22 19:59:07 UTC ---
Created an attachment (id=270009)
 View: https://bugzilla.gnome.org/attachment.cgi?id=270009
 Review: https://bugzilla.gnome.org/review?bug=722981&attachment=270009

autodetect: demote candidate error to warning and plug fake{sink,src}

In the case where we have no suitable candidate we post a warning and plug a
fake-element. Do the same when non of the candidate work.

This is more consistent and plugin the fakesink as a fallback is probably
helpful for running unit tests without requiring hardware src/sink elements.

Fixes #722981

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