[Bug 743994] validate: Misc patches to fix bugs and implement small features

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=743994
  GStreamer | gst-devtools | unspecified

--- Comment #5 from Thibault Saunier <tsaunier at gnome.org> 2015-02-04 14:38:49 UTC ---
Created an attachment (id=296109)
 View: https://bugzilla.gnome.org/attachment.cgi?id=296109
 Review: https://bugzilla.gnome.org/review?bug=743994&attachment=296109

validate: Properly advertise the wait action as ASYNC

And add some printing when executing the set-property action

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