software/kvm: Set cpu-max-count and ram-max-size defaults correctly

As cpu-count and ram-size can be setup freely by the user, the cpu-max-count
and ram-max-size shall follow it.

Otherwise it generates hard to track issues with starting VMs.
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Status Job ID Name Coverage
  External
passed SlapOS.SoftwareReleases.IntegrationTest-luke/fix/kvm-max-and-manual

01:50:36