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This adds 9-stream support to the centos element. See https://review.opendev.org/q/topic:cs9 for related patches. Change-Id: Ib80fbd21edb77c25764eff2c0d66e55bde7a90af
grub2
This image installs grub2 bootloader on the image, that's necessary for the local boot feature in Ironic to work. This is being made a separated element because usually images have grub2 removed for space reasons and also because they are going to boot from network (PXE boot).