OpenStack Compute (nova)

Add support for configuring L2 cache size for qcow2

Registered by Tim Bell

QCOW2 performance can be significantly improved by setting the l2-cache-size parameter for large qcow2 based storage (such as images and ephemeral drives) (see https://events.linuxfoundation.org/sites/events/files/slides/p0.pp_.pdf).

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