Issue SCRUM#47: Add log message to indicate reset

Signed-off-by: Lucas Fernandes de Oliveira <lfo14@inf.ufpr.br>

gesacmonit.py

@@ -769,6 +769,7 @@ class GesacMonit(multiprocessing.Process):
             # minutes from now
             if value < 0:
                 self._set_sample(point.id, new_sample)
+                self._logger.warning("Bad sample, the router was likely restarted, point {}".format(point))
                 return
             elif value > 0:
                 data[field] = value