LAVA master image scripts

Merge proposals dependent on lp://qastaging/~dpigott/lava-master-image-scripts/apply-initramfs-workaround

  1. apply-initramfs-workaround
  2. Dependent merge proposals

lp://qastaging/~dpigott/lava-master-image-scripts/apply-initramfs-workaround has no merge proposals.