[RFE] Auto allocated topology with no SNAT

[Boden R]

Today the neutron auto-allocated-topology (aka "get me a network") plugin/service allocates a router using the default enable_snat value for routers (True); so the resulting topology always has SNAT enabled. Some deployments would benefit from the ability to provision auto-allocated topologies that disable SNAT routing directly into the address space of the external network.

One such way to support this ability would be to provide a simple configuration option such as `auto_topology_enable_snat` that's used by the service plugin when provisioning the router (for `enable_snat`). This would allow deployers the ability to configure the default SNAT behavior for auto-allocated topologies.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/457433

[Armando Migliaccio (armando-migliaccio)]

We should probably favor effort [1] rather than customize the existing logic. If [1] gets implemented, then possibilities are endless.

[1] https://bugs.launchpad.net/neutron/+bug/1690438

[Armando Migliaccio (armando-migliaccio)]

This bug has had a related patch abandoned and has been automatically un-assigned due to inactivity. Please re-assign yourself if you are continuing work or adjust the state as appropriate if it is no longer valid.

[OpenStack Infra (hudson-openstack)]

Change abandoned by Armando Migliaccio (<email address hidden>) on branch: master
Review: https://review.openstack.org/457433
Reason: This review is > 4 weeks without comment and currently blocked by a core reviewer with a -2. We are abandoning this for now. Feel free to reactivate the review by pressing the restore button and contacting the reviewer with the -2 on this review to ensure you address their concerns.