Image installation steps common to RHEL, CentOS, Fedora and openEuler.
If used to build an image form a cloud image compress with xz (the default in centos), this element uses “unxz” to decompress the image. Depending on your distro you may need to install either the xz or xz-utils package.
Use the local path of a qcow2 cloud image. This is useful in that you can use a customized or previously built cloud image from diskimage-builder as input. The cloud image does not have to have been built by diskimage-builder. It should be a full disk image, not just a filesystem image.
Specify if kernel needs to be cleaned up or not. When set to true, the bits that cleanup old kernels will not be executed.