tools/modprobe: standardize on --show-foo, deprecate the rest

tools/modprobe: standardize on --show-foo, deprecate the rest

Currently we have a range of options which show specific details,
although they vary in prefix or spelling:
 - prefix: dump vs resolve vs show
 - with and without dash after show

Converge on --show-foo and deprecate the rest. The old options are still
accepted but will throw a warning. Only the (new) consistent names are
listed in --help, while the manual page lists both but spells out that
the old ones will be removed.

To avoid any confusion with --show (aka --dry-run) the option is also
soft-deprecated.

Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
Link: https://github.com/kmod-project/kmod/pull/353
Signed-off-by: Lucas De Marchi <lucas.de.marchi@gmail.com>