Add puppet to provision.py

We don't use it to set up the dev VM environment, but we do use it to
verify the Voyager puppet configuration parses in lint-all.

(imported from commit 3f116633ba3f535dfb4ae27915b6356e560ac84f)

provision.py

@@ -33,6 +33,7 @@ APT_DEPENDENCIES = {
         "npm",
         "node-jquery",
         "yui-compressor",
+        "puppet",               # Used by lint-all
     ]
 }