Fix protoc.sh to output retry logging on stderr (#18669)
Fix protoc.sh to output retry logging on stderr (#18669)


istio/istio,smawson/istio,smawson/istio,smawson/istio,smawson/istio,istio/istio,istio/istio,smawson/istio,smawson/istio,istio/istio,istio/istio