[Bug 742966] validate: launcher: Fix test log header output

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=742966
  GStreamer | gst-devtools | git

Thibault Saunier <tsaunier> changed:

           What    |Removed                     |Added
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   Target Milestone|HEAD                        |1.5.1

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