Nisar Khan 2d676138e1 SNAT cleanup and coverage hardening

Remove dead distributed SNAT helper/query code and clean up redundant
test definitions. Add missing SNAT unit coverage for RPC/HSI, PBR
destination updates, and pre/postcommit notification paths.
Change-Id: I8906adfc459a9f39da9ddcefd8ab0f5c068218e3

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Group Based Policy (GBP) provides declarative abstractions for achieving scalable intent-based infrastructure automation.

GBP complements the OpenStack networking model with the notion of policies that can be applied between groups of network endpoints. As users look beyond basic connectivity, richer network services with diverse implementations and network properties are naturally expressed as policies. Examples include service chaining, QoS, path properties, access control, etc.

GBP allows application administrators to express their networking requirements using a Group and a Policy Rules-Set abstraction. The specifics of policy rendering are left to the underlying pluggable policy driver.

GBP model also supports a redirect operation that makes it easy to abstract and consume complex network service chains and graphs.

Checkout the GBP wiki page for more detailed information: <https://wiki.openstack.org/wiki/GroupBasedPolicy>

The latest code is available at: <http://git.openstack.org/cgit/openstack/group-based-policy>.

GBP project management (blueprints, bugs) is done via Launchpad: <https://launchpad.net/group-based-policy>

For help using or hacking on GBP, you can send mail to <mailto:openstack-dev@lists.openstack.org>.

Acronyms used in code for brevity:

PT: Policy Target
PTG: Policy Target Group
PR: Policy Rule
PRS: Policy Rule Set
L2P: L2 Policy
L3P: L3 Policy
NSP: Network Service Policy
EP: External Policy
ES: External Segment
SC: Service Chain
SP: Service Profile