Ensure we have by default a temporary directory inside buildout

This is a follow up for #29

Having a temporary directory inside the buildout allows to avoid
permission issues when running commands inside /tmp

Author: ale-rt

config/base.cfg

@@ -20,10 +20,16 @@ recensio.regio = 2.0.0
 [settings]
 plone_listen_host = 0.0.0.0
 zeo_address = ${buildout:directory}/var/zeo.socket
-tmpdir =
+tmpdir = ${buildout:directory}/var/tmp
 http-fast-listen = off
 
+[create_tmpdir]
+recipe = z3c.recipe.mkdir
+paths = ${settings:tmpdir}
+mode = 0700
+
 [instance]
+=> create_tmpdir
 recipe = plone.recipe.zope2instance
 eggs =
     eea.facetednavigation

config/versions.cfg

@@ -7,6 +7,7 @@ slc.zopescript = 2.0.0a1
 superlance = 2.0.0
 zope.app.publication = 4.5
 zope.session = 4.5
+z3c.recipe.mkdir = 2.0
 
 # Required by:
 # recensio.plone==2.0.0.dev0