164295 – databases/godis: Fixed authenticaton to database != 0

no flags

Currently godis select database and then authenticate to it,
this fail because auth command must be called before select.

Connecting to db == 0 with authentication works,
because db == 0 is default one and select command is not used in this case.

How-To-Repeat: 

Simple code that should work if you can connect to db == 1 with authentication. Change "secret" to your password before use.

---- begin of test.go ----
package main

import (
    "godis"
)

func main() {
    db := godis.New("", 1, "secret")

    foo, err := db.Get("foo")
    if err == nil {
        println(foo.String())
    } else {
        println(err.String())
    }
}
---- end of test.go ----