scylla-artifacts.py: Increase the timeout for scylla DB to be up
scylla-artifacts.py: Increase the timeout for scylla DB to be up

Since now with iotune the startup time is a lot longer than
what it used to be.

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

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