Since the default kernel is a protected package, removing it, even in
the chroot environment, may fail. This fix forces the removal by
disabling the protected_packages configuration.
Change-Id: Ib7c849cf6aa2b1716cfddfe6e852dae482e00301
Replaces the default kernel with the realtime kernel
bp tripleo-realtime
Depends-On: I39580b3bca5c585a0e29e47e0ae857a292cf29aa
Change-Id: Iff34b8328868f3752963a4d9c46d5154dc862eab