scylla-artifacts.py: Fix problem with scylla io setup command
scylla-artifacts.py: Fix problem with scylla io setup command

Let's use tee instead of shell redirection. Also, this is only
needed on non-AMI testing.

Signed-off-by: Lucas Meneghel Rodrigues <8ad3460456640ab580599f5440c5a8d925a620b9@scylladb.com>

scylladb/scylla-artifact-tests,lmr/scylla-artifact-tests,scylladb/scylla-artifact-tests