This change does several things:
1) Clarifies how we handle xDS version_info in responses and sets us up
for both top-level/transactional versions as well as per-resource
versions in the future.
2) Moves the config_dump admin endpoint to the v2alpha namespace so that
we can iterate on it in the future.
3) Fills out the config dump proto for the remaining resource types.
These are not implemented but are here to force a discussion about
how we want to handle versions moving forward.
4) Fixes RDS static config dump to actually work and add better tests.
5) Wire up version for the RDS config dump on a per-resource basis.
Once we agree on the general version semantics I will be following up
with dump capability of the remaining resource types.
Part of https://github.com/envoyproxy/envoy/issues/2421
Part of https://github.com/envoyproxy/envoy/issues/2172
Fixes https://github.com/envoyproxy/envoy/issues/3141
Signed-off-by: Matt Klein <mklein@lyft.com>
Mirrored from https://github.com/envoyproxy/envoy @ ada758739907628b50079b9adfccf5481ec9fc5f
data-plane-api(CircleCI)