Get Deribit accounts

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

Name	Type	Description
account_name	string	Deribit account name

// An example of a response message
{
    "jsonrpc" : 2.0,
    "method" : "/private/deribit_accounts",
    "result" :[
        "cook_account_1",
        "cook_account_2"
    ],
    "id" : 1
}