round-robin-baseline.sh: Only need major and minor revision to rewrite the baseline.

The purpose is to rewrite-baseline is performed before starting the build

Advantages :
1- Do not wait for a successful build to rewrite the history.
2- Start the build with an up-to-date history.
 . This may imply, that we can now count on the history, and may be
   avoid fetching bmk history from the raw results (annex).
 . To fully count on the histiory we may need to remove the maximum
   number of build round-robin-baseline.sh proceeds.
3- Another advantage is that regression emails will not be lost if
   the build times out during history rewrite.

Disadvantage :
1- A "forced" builds triggered by bisect may timeout during history
   rewrite, and bisect will have to run again.

Change-Id: I16910ad7c381387e5bd0209cc386db6fd1a5d3c7

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