Task SSB-42: Do not print but use the logger

CAL/CalibrationCommon/lib/datacontainers/holography_dataset.py

@@ -74,7 +74,7 @@ class HolographyDataset():
                         ho.ms_for_a_given_beamlet_number[beamlet].\
                         read_cross_correlation_time_flags_per_station_names(station_name,
                                                                  self.reference_stations)
-                    print(reference_station_names)
+                    logger.debug(reference_station_names)
                     for reference_station_index, reference_station in\
                             enumerate(reference_station_names):