Bug fix to handle shoulder string with dot

current script failed on the following  shoulder.minter which contains
a dot in the  shoulder string 's6.caida':
'https://n2t.net/a/ezid/m/ark/d1986/s6.caida',
'https://n2t.net/a/ezid/m/ark/81986/s6.caida',

Use build-in function impl.nog.bdb.get_bdb_path_by_shoulder_model(shoulder_model) to handle this.

ezidapp/management/commands/diag-create-missing-minters-tmp-fix.py

@@ -92,9 +92,8 @@ def create_missing_minters(self):
                 unspecified_count += 1
                 continue
 
-            naan_str, shoulder_str = re.split(r'[/:.]', s.minter)[-2:]
             # noinspection PyProtectedMember
-            bdb_path = impl.nog.bdb._get_bdb_path(naan_str, shoulder_str, root_path=None)
+            bdb_path = impl.nog.bdb.get_bdb_path_by_shoulder_model(s)
             if pathlib.Path(bdb_path).exists():
                 continue