[3.2] cleos Http 1.1 support and improves response handling #533
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Backport EOSIO/eos#9349
Resolve #430
From the original PR:
Upgrades cleos http 1.0 to 1.1: in more advanced cloud stacks cleos is being rejected by gateways or proxies with HTTP status 426:
The HTTP 426 Upgrade Required client error response code indicates that the server refuses to perform the request using the current protocol but might be willing to do so after the client upgrades to a different protocol. The server sends an Upgrade header with this response to indicate the required protocol(s).
Removes unnecessary json parsing if it's an error code
Straight dump responses for --print-response if unable to convert to variant