add short connector slug for backward compatibility

passerelle_montpellier_sig/models.py

@@ -30,6 +30,10 @@ class MontpellierSig(BaseResource):
     class Meta:
         verbose_name = _('Montpellier SIG Web Service')
 
+    @classmethod
+    def get_connector_slug(cls):
+        return 'montpellier-sig'
+
     def sig_request(self, endpoint, **kwargs):
         logger = logging.getLogger(__name__)