Override parameters from the command line: bootdevice, kernel path, initrd path and script path

[Paolo Pisati]

While building armhf images in chroot, i usually need to install kernel, initrd, script, etc in unusual places (or at least places different than the one presented in the database), so i came up with these command line switched that let me override the values loaded from the db.

[Ubuntu Foundations Team Bug Bot (crichton)]

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[Balint Reczey (rbalint)]

I think overriding the database in those cases would be a reasonably easy solution and it would not require adding switches which would be rarely used.