Correcting killall command run on ubuntu

Hello,

When using the /kill_all_by_name service on ubuntu, it fails. This happens because the "-m" parameter is not valid for that particular distro, whereas it is a valid one for BSD (i.e mac).

I've corrected the getLinuxCommand and getCommand on KillAllByName.java so it executes "killall -v -r "  on Ubuntu/Linux and "killall -v -m" on MacOS.