Overhaul to fix remained bugs

I rewrote entirely to fix the ToDo bugs. Now, out_hash_forward extends out_forward plugin, does not plant. 

    # ToDo: FIX TO MAKE THIS WORK
    #<server>
    #  host 192.168.1.5
    #  port 24224
    #  standby true
    #</server>

    # ToDo: FIX TO MAKE THIS WORK
    #<secondary>
    #  type file
    #  path /var/log/fluent/forward-failed
    #</secondary>