allowed tracers to use CDS clusters. But zipkin proto doc still says bootstrap cluster is mandatory
Risk Level: Low
Testing: N/A
Signed-off-by: Rama Chavali <rama.rao@salesforce.com>
Mirrored from https://github.com/envoyproxy/envoy @ 6706d4413ad168d58267ee456428e56c9f0f78a5
Split Tracing.Http and provider-specific configurations out of trace.proto
Risk Level: Medium
Testing: unit tests
Docs Changes: N/A
Release Notes: N/A
Fixes: #10576
data-plane-api(Azure Pipelines)