[Crunch2] crunch-run fails trying to set swappiness on ubuntu 1204 kernel
The zero value of dockerclient.HostConfig has MemorySwappiness 0, which means "set swappiness to zero". This fails on older kernels (like Ubuntu 12.04).
If MemorySwappiness -1 then docker does not try to change swappiness at all.
I suspect we really intended the -1 behavior ("leave things alone"), and the only reason we're using 0 is that we followed the "zero value means do the normal thing / don't need it, don't mention it" approach, which doesn't apply here.