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cf237e060a
A handful of cassandra-driver Cluster.shutdown() call sites in the
auth_cluster tests were missed by the previous sweep that introduced
safe_driver_shutdown(), because the local variable holding the Cluster
is named "c" rather than "cluster".
Direct Cluster.shutdown() is racy: the driver's "Task Scheduler"
thread may raise RuntimeError ("cannot schedule new futures after
shutdown") during or after the call, occasionally failing tests.
safe_driver_shutdown() suppresses this expected RuntimeError and
joins the scheduler thread.
Replace the remaining c.shutdown() calls in:
- test/cluster/auth_cluster/test_startup_response.py
- test/cluster/auth_cluster/test_maintenance_socket.py
with safe_driver_shutdown(c) and add the corresponding import from
test.pylib.driver_utils.
No behavioral change to the tests; only the driver teardown is
hardened against a known driver-side race.
Fixes SCYLLADB-1662
Closes scylladb/scylladb#29576