* operator: use camelCase
operator relies on merging using K8s libraries. K8s libraries use the
`json` tag. protobuf doesn't have a way to configure this (`json_tag` is
for `protobuf.json`, not `json`) and never will.
JSON tag comes from the protobuf name. So we can make it camelCase to
fix the above issue. This will have no impact on unmarshalling with jsonpb -- which we use in
all cases aside from the merging -- any casing is allowed.
This may be a breaking change in the protobuf sense (but NOT to Istio
users), but it doesn't really matter as until last week the operator
protobuf was not a real protobuf at all and relied on `sed` to make it
into the shape we want. Therefor, its not possible someone depended on
the operator protobuf being protobuf-compatible.
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John Howard