admin: show hostname in clusters output (#7362)
admin: show hostname in clusters output (#7362)

Part of https://github.com/envoyproxy/envoy/issues/1606

Risk Level: Low
Testing: Modified UT
Docs Changes: N/A
Release Notes: Added

Signed-off-by: Matt Klein <mklein@lyft.com>

Mirrored from https://github.com/envoyproxy/envoy @ 7816d5e4baa1dee7558572393c83fa1d96a5052a

lyft/envoy-api,lyft/envoy-api,lyft/envoy-api