erp5testnode: add slapos.cookbook dependencies.

Explicitely list them, because develop egg doesn't not guarantee respect of dependencies.

software/erp5testnode/software.cfg

@@ -45,7 +45,12 @@ eggs =
   zc.buildout
   slapos.libnetworkcache
   slapos.core
+  jsonschema
+  hexagonit.recipe.download
+  netaddr
   inotifyx
+  lock_file
+  pytz
   erp5.util
   PyXML
 
@@ -77,3 +82,4 @@ PyXML = 0.8.5
 erp5.util = 0.4.41
 plone.recipe.command = 1.1
 slapos.recipe.template = 2.5
+jsonschema = 2.4.0