add verbose info for dm.get_refs

csst_common/data_manager.py

@@ -560,11 +560,13 @@ class CsstMsDataManager:
              'shutter': '/crdsroot/references/msc/csst_msc_ms_shutter_11_000001.fits'}
         """
         if self.crds.is_available:
+            print("Grab refs from CRDS ...")
             return self.crds.retry(
                 self.crds.get_refs, 3,
                 file_path=self.l0_detector(detector)
             )
         else:
+            print("Grab refs from local files ...")
             refs = dict()
             if self.datatype == "mbi":
                 ref_types = ["bias", "dark", "ledflat", "shutter"]