[nova] Increase minimum large VM size
[nova] Increase minimum large VM size

We disable DRS for all large VMs, but don't want to do it anymore for
VMs < 512 GiB. Therefore, we increase the largevm_mb setting to 512 GiB,
so that only VMs between >= 512 GiB (large VMs + big VMs) get DRS
disabled.

sapcc/helm-charts,sapcc/helm-charts,sapcc/helm-charts,sapcc/helm-charts