Fix MatrixService ordering

uncloud/uncloud_vm/models.py

@@ -60,6 +60,12 @@ class VMProduct(Product):
         return "Virtual machine '{}': {} core(s), {}GB memory".format(
                 self.name, self.cores, self.ram_in_gb)
 
+    @staticmethod
+    def allowed_recurring_periods():
+        return list(filter(
+            lambda pair: pair[0] in [RecurringPeriod.PER_MONTH, RecurringPeriod.PER_HOUR],
+            RecurringPeriod.choices))
+
 class VMWithOSProduct(VMProduct):
     pass