baremetal: rename os_image to bootstrap_os_image #2044
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Unlike other platforms, the baremetal platform uses a different RHCOS boot image for the bootstrap VM (i.e. a qcow image with libvirt) than for all other nodes (i.e. an Ironic-deployed image). Rename the terraform os_image variable to bootstrap_os_image to make it clear that this boot image is only used for the bootstrap VM.
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For the baremetal platform we require two different bootimages, the QEMU one for the libvirt based bootstrap VM, and the OpenStack one that contains the necessary Ironic config drive support to pass data to ignition. So we rework the Image abstraction by adding a new BootstrapImage type/asset, which returns the same as Image in all cases except for the baremetal platform. This also aligns with the tfvars renamed in openshift#2044 and allows us to pass the rhcos.QEMU image via BootstrapImage to terraform but leaves the OpenStack image URL available for future use to deploy masters via follow-up PRs that implement issue openshift#2060 and also correctly set the worker machineset providerSpec for the baremetal-operator. Related: openshift#2037
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Rename the terraform os_image variable to bootstrap_os_image to make it clear that this boot image is only used for the bootstrap VM.
Related to #2037