[Bug 692615] tests: use g_timeout_add_seconds

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=692615
  GStreamer | gst-plugins-good | git

Tim-Philipp Müller <t.i.m> changed:

           What    |Removed                     |Added
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           Severity|normal                      |enhancement

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