monitor: Generate scripts only once from extra-eggs

stack/monitor/buildout.cfg

@@ -35,7 +35,6 @@ url = ${:_profile_base_location_}/scripts/${:filename}
 destination = ${buildout:parts-directory}/monitor-scripts
 on-update = true
 
-
 [monitor-eggs]
 recipe = zc.recipe.egg
 eggs =
@@ -47,10 +46,14 @@ eggs =
   cns.recipe.symlink
   slapos.toolbox
 
+# Do no generate any scripts here as all of them are generated by extraeggs
+scripts =
+
 [extra-eggs]
-<= monitor-eggs
+recipe = zc.recipe.egg
 interpreter = pythonwitheggs
 eggs =
+  ${monitor-eggs:eggs}
   psutil
   PyRSS2Gen
   Jinja2