send SIGTERM to gracefully stop all child process of rabbitmq-server and ifmap

supervisor currently send SIGKILL to stop rabbitmq-server, which dosen't kills
the child processes of it, Fixed it by sending SIGTERM to kill all child process.

supervisor currently send SIGKILL to stop ifmap, which dosen't kills
the child processes of it, Fixed it by sending SIGTERM to kill all child process.

Change-Id: Ie005f0119cb6fdf3a55717c24349b793029ab5d9
Closes-Bug: 1381283