scripts/patchreview: Add commit to stored json data

Save commit data when writing to the json file so the results can
be copared/extended later.

(From OE-Core rev: da761ac1984ee2a06ded905fc4ad878ef7d613e4)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

scripts/contrib/patchreview.py

@@ -222,6 +222,7 @@ if __name__ == "__main__":
         row = collections.Counter()
         row["total"] = len(results)
         row["date"] = subprocess.check_output(["git", "-C", args.directory, "show", "-s", "--pretty=format:%cd", "--date=format:%s"]).decode("utf-8").strip()
+        row["commit"] = subprocess.check_output(["git", "-C", args.directory, "show", "-s", "--pretty=format:%H"]).decode("utf-8").strip()
         for r in results.values():
             if r.upstream_status in status_values:
                 row[r.upstream_status] += 1