Upstream XDS interop tests proto changes to grpc-proto.

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#6,719 opened on Feb 14, 2020 0 comments 0 reactions 1 assignee Claimed by @ericgribkoff View on GitHub

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Description

Even though the `grpc-proto` is not being really used. we should upstream new messages to grpc-proto.

https://github.com/grpc/grpc-java/blob/master/interop-testing/src/main/proto/grpc/testing/messages.proto

new messages: `LoadBalancerStatsRequest`, `LoadBalancerStatsResponse`

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