version: update to 20191217

This is aiming qemu 5.0.

This is equal to 20191206, however that was a partial
backport for regression happened in qemu 4.2 and
that got the 20191209 tag which will take over
20191206 when updated although that would be a downgrade
so we need a bigger tag.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
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