XXX stack/slapos: use slapos.cookbook pre-release

stack/slapos.cfg

@@ -40,6 +40,7 @@ exec-sitecustomize = false
 
 # Add location for modified non-official slapos.buildout
 find-links +=
+  https://lab.nexedi.com/jerome/slapos/raw/37e6f775dbb9624904fec68a21e0ddc5c1d49972/dist/slapos.cookbook-1.0.144a0.tar.gz
   http://www.nexedi.org/static/packages/source/
   http://www.nexedi.org/static/packages/source/hexagonit.recipe.download/
   http://www.nexedi.org/static/packages/source/slapos.buildout/
@@ -62,6 +63,7 @@ allow-hosts +=
   sourceforge.net
   www.dabeaz.com
   www.owlfish.com
+  lab.nexedi.com
 
 # Use an https index
 index = https://pypi.org/simple/
@@ -155,7 +157,7 @@ pyparsing = 2.2.0
 pytz = 2016.10
 requests = 2.13.0
 six = 1.12.0
-slapos.cookbook = 1.0.143
+slapos.cookbook = 1.0.144-alpha
 slapos.core = 1.5.12
 slapos.extension.strip = 0.4
 slapos.extension.shared = 1.0