Fix merge error

tests/integration_tests/test_single_container_termination.py

@@ -4,6 +4,7 @@
 from mango import Agent, create_container
 from mango.util.clock import ExternalClock
 from mango.util.termination_detection import tasks_complete_or_sleeping
+from mango.util.distributed_clock import DistributedClockAgent, DistributedClockManager
 from multiprocessing import Process