Re: [WIP 03/15] pkt-line: add delim packet support

> One of the design goals of protocol-v2 is to improve the semantics of
> flush packets.  Currently in protocol-v1, flush packets are used both to
> indicate a break in a list of packet lines as well as an indication that
> one side has finished speaking.  This makes it particularly difficult
> to implement proxies as a proxy would need to completely understand git
> protocol instead of simply looking for a flush packet.
>
> To do this, introduce the special deliminator packet '0001'.  A delim
> packet can then be used as a deliminator between lists of packet lines
> while flush packets can be reserved to indicate the end of a response.
>
> Signed-off-by: Brandon Williams <bmwill@google.com>