[PATCH] Change hash_data() input type to BLOB

[Federico Schwindt]

Hi,

I had some time in my recent flights so I decided to give it a shot.
As discussed at VDD15Q1, this changes the hash_data input to BLOB and adds
automatic conversion from STRING to BLOB.

There are a few downsides with this approach:

1. Every time we call hash_data() on something else than a BLOB we'll
perform the conversion.
If we assume that most people will not hash the body (a fair assumption I
believe) we're doing extra work that only favours a minority, penalising
the rest.

2. Adds more pressure to the already tight workspace. I guess we could use
something else here if required.

The other thing that bothers me somewhat is the naming behind the BLOBs,
vmod_priv.
If BLOBs will become a first class citizen we should rename it to something
that is not coupled to vmods. This is regardless of the direction we take.

A better alternative would be to teach vcc to issue two different calls
depending on the input, e.g. for BLOBs it will use VRT_hashblob(), for
anything else use VRT_hashstring(), so point 1 and 2 only affect users of
hash_data(req.body).

Comments? OKs?
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