This patch only moves rule definitions from policy.json to code.
Policies definitions e.g. "create_ports" or "get_ports" will
still be defined in the policy.json file.
In the future, policy definitions will be auto generated from model's
yaml files[1]. Then policy definitions will be removed from the
policy.json file.
[1] https://github.com/openstack/gluon/blob/master/doc/source/devref/gluon-auth.rst#defining-authorization-rules
Change-Id: I266ea81d1df198e775a93902984d9865fc6201a0
8fefd47b22