add undisable attribut to service

src/rougail/data/rougail.dtd

@@ -54,6 +54,7 @@
 <!ATTLIST service engine (none|creole|jinja2) #IMPLIED>
 <!ATTLIST service target CDATA #IMPLIED>
 <!ATTLIST service type (service|mount|swap) "service">
+<!ATTLIST service undisable (True|False) "False">
 
 <!ELEMENT ip (#PCDATA)>
 <!ATTLIST ip iplist CDATA #IMPLIED>

src/rougail/template/base.py

@@ -343,7 +343,7 @@ class RougailBaseTemplate:
                 service_name = await service_obj.option.description()
                 service_type = await service_obj.information.get('type', 'service')
                 if await service_obj.option('activate').value.get() is False:
-                    if included is False:
+                    if included is False and not await service_obj.information.get('undisable', False):
                         self.desactive_service(service_name, service_type)
                     continue
                 if not included: