When updating bt5, update repositories before even if they are already present

because new bt5 may have been added in the meantime.

slapos/recipe/erp5/erp5.py

@@ -155,17 +155,13 @@ class ERP5Updater(object):
   def isBusinessTemplateUpdated(self):
     return len(self.getMissingBusinessTemplateSet()) == 0
 
-  def isBusinessTemplateRepositoryUpdated(self):
-    return len(self.getMissingBusinessTemplateRepositoryList()) == 0
-
   def updateBusinessTemplateList(self):
     """ Update Business Template Configuration, including the repositories
     """
     if not self.isBusinessTemplateUpdated():
-      # Before update the business templates, it is required to make
-      # sure the repositories are updated.
-      if not self.isBusinessTemplateRepositoryUpdated():
-        # Require to update Business template Repository
+      # Before updating  the business templates,  it is required to  make sure
+      # the  repositories are  updated,  thus  update them  even  if they  are
+      # already present because there may be new business templates...
       repository_list = self.getSystemSignatureDict(
         "business_template_repository_list", [])
       repository_list.extend(self.getMissingBusinessTemplateRepositoryList())