[Bug 712785] New: cerbero: Log step output in individual log files

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=712785
  GStreamer | packages | git

           Summary: cerbero: Log step output in individual log files
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: packages
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: bilboed at bilboed.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Currently the output of every recipe step (fetch, extract, compile,...) is
outputted on stdout.

While this is useful for debugging/verifying all steps are being executed
properly, they have the following downsides:
* too much information (you don't really know where exactly you are in the full
process)
* if you want to log that information you need to log the full output
* you might want to only view such details later or only if something failed

The following patch solves this by logging each recipe step to log files.

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