stack.erp5: Fix instance upgrade from slapos.cookbook:generic.zope.zeo.client

slapos.cookbook:generic.zope.zeo.client did not let buildout know about
site.zcml file it creates. So it would not be deleted on update, making
slapos.cookbook:symbolic.link fail as it carefully avoids deleting
non-links.
So, copy site.zcml instead of sym-linking.

stack/erp5/buildout.cfg

@@ -342,7 +342,7 @@ md5sum = b0cb0ee97cddc79112a718e065806037
 [template-zope]
 <= download-base
 filename = instance-zope.cfg.in
-md5sum = 44773d69f85b605176f16df7d7bb8d97
+md5sum = e63ff201ee11567d35017314862f4ef3
 link-binary =
   ${aspell:location}/bin/aspell
   ${dmtx-utils:location}/bin/dmtxwrite

stack/erp5/instance-zope.cfg.in

@@ -199,9 +199,9 @@ parameters-extra = true
 command-line = '{{ parameter_dict['userhosts'] }}' '{{ bin_directory }}/runzope' -C '${:configuration-file}'
 
 [{{ section('zcml') }}]
-recipe = slapos.cookbook:symbolic.link
+recipe = slapos.cookbook:copyfilelist
 target-directory = ${directory:instance-etc}
-link-binary = {{ parameter_dict['site-zcml'] }}
+file-list = {{ parameter_dict['site-zcml'] }}
 
 [{{ section('zope-inituser') }}]
 recipe = slapos.recipe.template:jinja2