fail over: Change the first server pick logic
    
    The logic of selecting the server to fail over to was changed so
    that we start from the server next to the one that didn't work the last
    time. This is because the status of a server that failed last time might
    get reset before we try another one. This can cause that we try to use
    the nonworking server repeatedly, not giving a chance to other servers.
    
    Fixes: #321