v2 aligned buffer changes for erasure codes

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Hi,

following a is an updated patchset. It passes now make check in src

It has following changes:
 * use 32-byte alignment since the isa plugin use AVX2
   (src/erasure-code/isa/README claims it needs 16*k byte aligned buffers
   but I can't see a reason why it would need more than 32-bytes
 * ErasureCode::encode_prepare() handles more than one chunk with padding

cheers

Janne
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