policy.json: Allow one to manage them from the puppet module

This commit allow a deployer to manage the policies via this module
It relies on augeas to change only the policy needed. The init takes
a hash of policies and apply them.

Change-Id: I6ee27a1c4c26c73f5954e6462097fb5ed4dbb7ea
Merge "policy.json: Allow one to manage them from the puppet module"