shell-completion/*/lsmod: add bash/fish/zsh completion

shell-completion/*/lsmod: add bash/fish/zsh completion

Note that completions are explicitly aimed to be simple, depending on as
little as possible shell specific helpers.

The goal is that people unfamiliar with these can extend them with zero
ramp-up. Doing things efficiently or "properly" is somewhat secondary.

v2:
 - wire the completions to the autotools build

v3:
 - use SPDX style copyright statements

Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
Link: https://github.com/kmod-project/kmod/pull/138
Signed-off-by: Lucas De Marchi <lucas.de.marchi@gmail.com>