nodeID is empty when envoy reconnect to go-control-plane

[ElwinGao4444]

when I kill go-control-plane and restart it, envoy can not reconnect to it successful, I found that:

1. envoy re-send req to go-control-plane without "Node" struct
   
2. type Runtime have Node struct, but CDS, LDS don't have Node struct(I don't known what about others types)
   
3. when restart envoy, everythin is ok.

env: CentOS 7
envoy version: 50ef094/1.15.0/clean-getenvoy-2aa564b-envoy/RELEASE/BoringSSL
go-control-plane version:github.com/envoyproxy/go-control-plane v0.9.7-0.20200826174037-95aae272b9d1

[mattklein123]

Possibly related to #9682. cc @kyessenov

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