New electurm activation parametes

[mariocynicys]

Found here KomodoPlatform/komodo-defi-framework#1966 (comment) are some new electrum activation parameters (namely min_connected & max_connected)

New request format:

{
    "userpass": "{{userpass}}",
    "method": "electrum",
    "coin": "DOC",
    "servers": [
        {
            "url": "electrum1.cipig.net:10020"
        },
        {
            "url": "electrum2.cipig.net:10020"
        },
        {
            "url": "electrum3.cipig.net:10020"
        }
    ],
    // the new parameters:
    // any of the following parameters could be omitted and it will be set to the default
    "min_connected": 1, // defaults to 1 when omitted
    "max_connected": 3  // defaults to len(servers) when omitted
}

Setting min_connected to 0 should error and also if min_connected > max_connected.