The argument is superfluous because only run/image/uboot evaluated it
anyway, and the argument is always boot/image.elf. With this change, the
official semantics of run_image become: "replace the boot/image.elf file
by platform-specific file(s) at boot/ that can actually be booted".
Issue #4730
Also remove 'requires_installation_of', while also checking sbin
directories in 'have_installed'. The run scripts have been adjusted
accordingly.
Fixes#2853
Newer revisions of parted require special privileges due to use of the
dmidecode tool, which logs permission errors to standard error. In these
cases parted still succeeds with its operation, so just ignore the
jabbering and prevent expect to exit.
