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: I534e76f4f7385e9057aaee0a5ec5d463dc918646
Merge "policy.json: Allow one to manage them from the puppet module"