erp5: Add support for legacy default software_type value.

Also, remove dead section "cluster".

stack/erp5/buildout.cfg

@@ -230,7 +230,7 @@ md5sum = ba1b23177e101b5b9f03e1c5009c81fc
 # XXX: "template.cfg" is hardcoded in instanciation recipe
 filename = template.cfg
 template = ${:_profile_base_location_}/instance.cfg.in
-md5sum = 95f85fdc55e70937eac39bbfe32042cf
+md5sum = ed053189e234a27f0b2f2b8b53c532bf
 extra-context =
     key mariadb_link_binary template-mariadb:link-binary
     key zope_link_binary template-zope:link-binary

stack/erp5/instance.cfg.in

@@ -75,10 +75,6 @@ extra-context =
     key software_type :software-type
 software-type = default
 
-[dynamic-template-erp5-cluster]
-< = dynamic-template-erp5
-software-type = cluster
-
 [dynamic-template-erp5-RootSoftwareInstance]
 < = dynamic-template-erp5
 software-type = RootSoftwareInstance
@@ -244,6 +240,8 @@ override = {{ dumps(override_switch_softwaretype |default) }}
 # Public software types
 default = ${dynamic-template-erp5:rendered}
 create-erp5-site = ${dynamic-template-create-erp5-site:rendered}
+# BBB: Legacy software types, aliased to "default"
+RootSoftwareInstance = ${dynamic-template-erp5-RootSoftwareInstance:rendered}
 # Internal software types
 kumofs = ${dynamic-template-kumofs:rendered}
 cloudooo = ${dynamic-template-cloudooo:rendered}