add valid_enum with function and rename domain type to domainname

tests/eosfunc/test.py

@@ -1,5 +1,10 @@
 from tiramisu import valid_not_equal, valid_ip_netmask, calc_value, valid_in_network
 
+
+def trange(start, stop):
+    return list(range(start, stop))
+
+
 def calc_val(*args, **kwargs):
     if len(args) > 0:
         return args[0]