killall command

in a fringe case, if a user installed teamspeak then removed the
~/private/teamspeak folder, but left the instance running (PID) the
start_script would encounter an error. and the setup would not be
completed in a single run if the bash script.

This command checks for any instance of teamspeak linux server and kills
it before runnning the script to remove this issue. Fixes an issue they
never knew they had.