CLOUDSTACK-7153: only archive the zipped hyperv image

Cherry-pick of d09acc44f2b36cd593ebe97ab1673b7757ea2c25.
Serverspec test support for systemvm.

This is a cherry-pick / squash of the serverspec work from
  sbp/feature/systemvm/persistent-config as of
  1b1b2b1b2bd8b12ad41fcb2aa46683099b80d532
Merge branch 'feature/systemvm-refactor' into feature/systemvm-persistent-config