Cancel all quotes

Name	Type	Required	Description
currency	string	true	BTC / ETH

// An example of a request message
{
    "jsonrpc" : 2.0,
    "method" : "/private/cancel_all_quote",
    "params" : {
        "currency":"BTC"
    },
    "id" : 1
}

// An example of a response message
{
    "jsonrpc" : 2.0,
    "method" : "/private/cancel_all_quote",
    "result" : "ok",
    "id" : 1
}