This commit registers all policies formally kept in policy.json as
defaults in code. This is an effort to make policy management easier
for operators. More information on this initiative can be found
below:
https://governance.openstack.org/tc/goals/queens/policy-in-code.html
bp policy-and-docs-in-code
Change-Id: Ibab08f8e1c95b86e08737c67a39c293566dbabc7
