This commit converts the existing neutron-fwaas policy.json
into policy-in-code.
policy.json for testing is also removed. As a result, setup_config()
in neutron_fwaas.tests.base.NeutronDbPluginV2TestCase is no longer
required now (as the content of setup_config() is now same as that
in neutron).
Partially Implements: blueprint neutron-policy-in-code
Change-Id: I67be3a21f19e3f793312d64d358452ee4531c080