slaprunner: install scripts from dependents eggs

We need slapos script from slapos.core, which is a dependency of
erp5.util

software/slaprunner/common.cfg

@@ -140,6 +140,7 @@ filename = slapos-slapuser-script.in
 
 [eggs]
 recipe = zc.recipe.egg
+dependent-scripts = true
 eggs =
   ${pycurl:egg}
   collective.recipe.template