Add support for custom token key in request header

[farnabaz]

Sometimes we need to change token key name in requests header, in order to support custom token name we could define new option in local strategy. lets call it tokenName

    auth: {
        strategies: {
            local: {
                tokenName: 'x-auth',
                endpoints: ...
            }
        }
    }

[pi0]

Thanks!

[pi0]

Shipped in 4.2.0