kvm: Increase default VM parameters to match nowadays requirement

KVM which defaults to 1024 RAM, 10 GB disk and 1 CPU is too small for nowadays
OS requirements, so to avoid confusions, increase the defaults.
1 job for feature/kvm-increase-default (queued for 2 seconds)
Status Job ID Name Coverage
  External
running SlapOS.SoftwareReleases.IntegrationTest-py3-luke/feature/kvm-increase-default

27316:12:18