[1.9.x] server: ensure that central service config flattening properly resets the state each time #10245
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The prior solution to call reply.Reset() aged poorly since newer fields
were added to the reply, but not added to Reset() leading serial
blocking query loops on the server to blend replies.
This could manifest as a service-defaults protocol change from
default=>http not reverting back to default after the config entry
reponsible was deleted.
Backport of #10239 to 1.9.x