Support multiple Redis servers connection with auth

[n3g2]

When using multiple redis connections with auth, you want to support the following configuration.

const config = {
    protocol: 'redis',
    pack: 'redis',
    unpack: 'redis',
    balance: 'random',
    protocol: 'redis',
    server:[
        {
            host: '10.x.x.1.',
            port: 8379,
            password: '123abc'
        },
        {
            host: '10.x.x.2,
            port: 8379,
            password: 'abc123'
        },
        ...more
    ]
};