Add puppet-pull helper script

It allows users to sync manifests and run puppet directly
from managed node without touching anything else.
Just run puppet-pull on any managed node and it will
download latest manifests from the master node and
run puppet to apply them.

It could be very usefull for debugging.

Change-Id: I4a83b4dc81da5991d449f69e4c76ee0309e89205
Merge "Add puppet-pull helper script"