pillar/kvm: account vRAM for the container overhead limit #1795

Job	Run time
packages (arm64-secure, arm64)	6m 56s
packages (ubuntu-20.04, amd64)	6m 30s
packages (ubuntu-latest, riscv64)	4m 7s
verification (arm64, kvm)	14m 26s
eve (arm64, kvm)	35m 37s
verification (arm64, xen)	12m 40s
manifest	4m 43s
eve (arm64, xen)	29m 13s
verification (amd64, kvm)	12m 12s
eve (amd64, kvm)	28m 8s
verification (amd64, xen)	12m 13s
eve (amd64, xen)	34m 11s
eve (riscv64, mini)	4m 34s
	3h 25m 30s

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