tools: kmod: print help message when no commands given
tools: kmod: print help message when no commands given

pmmccorm/kmod,lpereira/kmod,pmmccorm/kmod,lpereira/kmod,lucasdemarchi/kmod,Distrotech/kmod,lucasdemarchi/kmod,Distrotech/kmod,pmmccorm/kmod,lucasdemarchi/kmod,Distrotech/kmod,lpereira/kmod