Update scylla-ami submodule
Update scylla-ami submodule

* dist/ami/files/scylla-ami 02b1853...8a6e4dd (1):
  > ds2_configure.py: always use Ec2Snitch for single region case

Fixes #1800.

scylladb/scylla,duarten/scylla,avikivity/scylla,avikivity/scylla,duarten/scylla,scylladb/scylla,duarten/scylla,scylladb/scylla,avikivity/scylla,scylladb/scylla