revert to use slapos.core = 0.35.1.

running cp using slapos.core 1.0.0 in sr does not work.

stack/erp5/buildout.cfg

@@ -666,7 +666,7 @@ qrcode = 4.0.4
 requests = 2.1.0
 restkit = 4.2.2
 rtjp-eventlet = 0.3.2
-slapos.core = 1.0.0
+slapos.core = 0.35.1
 slapos.recipe.build = 0.12
 slapos.recipe.template = 2.4.2
 slapos.toolbox = 0.33.1