Adding -b (buffer size) parameter to varnishtest

[Poul-Henning Kamp]

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In message <CABoVN9C=f53dbP-KogJ7Cepb1t_vZjDpfTgSaCu6Ptdw8GB05Q at mail.gmail.com>
, Dridi Boukelmoune writes:
>On Thu, Sep 10, 2015 at 1:26 PM, Carlos Abalde <carlos.abalde at gmail.com> wrote:
>> Hi,
>>
>> When implementing in VCL complex logic (not necessarily related with caching contents -e.g. access control, rate limiting, etc.-) varnishtest is a powerful tool to automate VCL testing. These type of tests sometimes are complex and they are not easy to split in smaller pieces.
>
>Hi Carlos,
>
>One nitpick: I believe it should display the default value in the man
>(and maybe usage too).

Also, please use the VNUM_2bytes() function so one can write "512K"
rather than a implied "K"

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