scalability: clean up

stack/erp5/buildout.cfg

@@ -167,10 +167,8 @@ ugly-depend-on = ${erp5:repository}
 recipe = slapos.recipe.build:gitclone
 repository = http://git.erp5.org/repos/slapos.git
 #branch = erp5-cluster
-git-executable = ${git:location}/bin/git
-#repository = http://192.168.242.77:1236/slapos.git
-
 branch = erp5-cluster-scalability
+git-executable = ${git:location}/bin/git
 
 [slapos.cookbook]
 recipe = zc.recipe.egg
@@ -390,9 +388,9 @@ repository_id_list = erp5
 
 [erp5]
 recipe = slapos.recipe.build:gitclone
+# Do not specify revision or branch here, the section will be
+# overloaded via an extern software.cfg
 repository = http://git.erp5.org/repos/erp5.git
-#repository = http://192.168.242.77:1235/erp5.git
-#branch = master
 git-executable = ${git:location}/bin/git
 
 [fix-products-paths]