rpc: Correct JSON-RPC and gRPC verifymessage. #2150
Merged
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This corrects the main logic that verifies messages to create a p2pkh address from the recovered public key instead of a p2pk since p2pkh is what is produced when signing and therefore what is required when verifying (as can be verified in dcrd as well).
This also updates the call sites that decode the addresses to properly reject p2pk addresses for the same reason.