Update scylla-ami submodule
Update scylla-ami submodule

* dist/ami/files/scylla-ami b2724be...b3b85be (1):
  > adding --stop-services

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