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

[GStreamer (bugzilla.gnome.org)]

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

           Summary: validate: launcher: Fix test log header output
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-devtools
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: ramiro.polla at collabora.co.uk
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Currently gst-validate-launcher writes headers to the log files after the tests
have already run, thus overwriting the beginning of the file. Attached patch
writes the header before running the tests.

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