dist: handle SIGKILL correctly on upstart, also do not respawn process
dist: handle SIGKILL correctly on upstart, also do not respawn process

Fixes #510

kjniemi/scylla,scylladb/scylla,scylladb/scylla,raphaelsc/scylla,kjniemi/scylla,duarten/scylla,raphaelsc/scylla,avikivity/scylla,avikivity/scylla,duarten/scylla,scylladb/scylla,scylladb/scylla,avikivity/scylla,duarten/scylla,raphaelsc/scylla,kjniemi/scylla