Fix how lxml-python was linked in lxc SR

software/lxc/software.cfg

@@ -3,8 +3,10 @@
 extends =
   ../../stack/slapos.cfg
   ../../component/lxc/buildout.cfg
+  ../../component/lxml-python/buildout.cfg
 
 parts =
+  lxml-python
   template
   template-lxc
   slapos-cookbook
@@ -29,7 +31,6 @@ mode = 0644
 recipe = zc.recipe.egg
 scripts = slapcontainer
 eggs =
-  ${lxml-python:egg}
   slapos.toolbox
 
 [versions]