According to the help text of createrawtransaction, the following args are accepted:
```
Arguments:
1. "inputs"                (string, required) A json array of json objects
2. "outputs"               (string, required) a json object with outputs
3. locktime                  (numeric, optional, default=0) Raw locktime. Non-0 value also locktime-activates inputs
```

however, this does not match the named args ( https://github.com/bitcoin/bitcoin/blob/8152d3fe57a991e9088d0b9d261d2b10936f45a9/src/rpc/client.cpp#L84 )

Imo, backporting a breaking change to 0.14.1 is reasonable. Though, I'd like to hear other opinions.
{
    if (request.fHelp || request.params.size() < 1 || request.params.size() > 2)
        throw std::runtime_error(
            "sendrawtransaction \"hexstring\" ( allowhighfees )\n"
            "\nSubmits raw transaction (serialized, hex-encoded) to local node and network.\n"
            "\nAlso see createrawtransaction and signrawtransaction calls.\n"
            "\nArguments:\n"
            "1. \"hexstring\"    (string, required) The hex string of the raw transaction)\n"
            "2. allowhighfees    (boolean, optional, default=false) Allow high fees\n"
            "\nResult:\n"
            "\"hex\"             (string) The transaction hash in hex\n"
            "\nExamples:\n"
            "\nCreate a transaction\n"
            + HelpExampleCli("createrawtransaction", "\"[{\\\"txid\\\" : \\\"mytxid\\\",\\\"vout\\\":0}]\" \"{\\\"myaddress\\\":0.01}\"") +
            "Sign the transaction, and get back the hex\n"
            + HelpExampleCli("signrawtransaction", "\"myhex\"") +
            "\nSend the transaction (signed hex)\n"
            + HelpExampleCli("sendrawtransaction", "\"signedhex\"") +
            "\nAs a json rpc call\n"
            + HelpExampleRpc("sendrawtransaction", "\"signedhex\"")
        );