Updated make stop_simulator to properly stop all simulators when multiple are running
Updated make stop_simulator to properly stop all simulators when multiple are running

Seagate/kinetic-c,Kinetic/kinetic-c,kinjalcpatel/kinetic-c,rcrane/kinetic-c,Kinetic/kinetic-c,chenchongli/kinetic-c,kinjalcpatel/kinetic-c,kinjalcpatel/kinetic-c,Kinetic/kinetic-c,Seagate/kinetic-c,chenchongli/kinetic-c,benmcclelland/kinetic-c,Seagate/kinetic-c,rcrane/kinetic-c,benmcclelland/kinetic-c,benmcclelland/kinetic-c,benmcclelland/kinetic-c,Seagate/kinetic-c,chenchongli/kinetic-c,kinjalcpatel/kinetic-c,Kinetic/kinetic-c,benmcclelland/kinetic-c,chenchongli/kinetic-c,rcrane/kinetic-c,rcrane/kinetic-c