SSH Exception in TestMirrorMakerService.test_simple_end_to_end.source_type=redpanda

[r-vasquez]

Found in: https://buildkite.com/redpanda/redpanda/builds/18626#01847d08-5a01-43ed-8d34-cd3c8fa1579b/6-403

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  | test_id:    rptest.tests.mirror_maker_test.TestMirrorMakerService.test_simple_end_to_end.source_type=redpanda
  | status:     FAIL
  | run time:   9.222 seconds
  |  
  |  
  | SSHException('Unable to open channel.')
  | Traceback (most recent call last):
  | File "/usr/local/lib/python3.10/dist-packages/ducktape/tests/runner_client.py", line 135, in run
  | data = self.run_test()
  | File "/usr/local/lib/python3.10/dist-packages/ducktape/tests/runner_client.py", line 227, in run_test
  | return self.test_context.function(self.test)
  | File "/usr/local/lib/python3.10/dist-packages/ducktape/mark/_mark.py", line 476, in wrapper
  | return functools.partial(f, *args, **kwargs)(*w_args, **w_kwargs)
  | File "/root/tests/rptest/services/cluster.py", line 35, in wrapped
  | r = f(self, *args, **kwargs)
  | File "/root/tests/rptest/tests/mirror_maker_test.py", line 129, in test_simple_end_to_end
  | self.start_brokers(source_type=source_type)
  | File "/root/tests/rptest/tests/mirror_maker_test.py", line 82, in start_brokers
  | self.source_broker.start()
  | File "/root/tests/rptest/services/redpanda.py", line 860, in start
  | self._for_nodes(to_start, start_one, parallel=parallel)
  | File "/root/tests/rptest/services/redpanda.py", line 781, in _for_nodes
  | return list(executor.map(cb, nodes))
  | File "/usr/lib/python3.10/concurrent/futures/_base.py", line 621, in result_iterator
  | yield _result_or_cancel(fs.pop())
  | File "/usr/lib/python3.10/concurrent/futures/_base.py", line 319, in _result_or_cancel
  | return fut.result(timeout)
  | File "/usr/lib/python3.10/concurrent/futures/_base.py", line 451, in result
  | return self.__get_result()
  | File "/usr/lib/python3.10/concurrent/futures/_base.py", line 403, in __get_result
  | raise self._exception
  | File "/usr/lib/python3.10/concurrent/futures/thread.py", line 58, in run
  | result = self.fn(*self.args, **self.kwargs)
  | File "/root/tests/rptest/services/redpanda.py", line 854, in start_one
  | self.start_node(node,
  | File "/root/tests/rptest/services/redpanda.py", line 1111, in start_node
  | node.account.mkdirs(os.path.dirname(RedpandaService.NODE_CONFIG_FILE))
  | File "/usr/local/lib/python3.10/dist-packages/ducktape/cluster/remoteaccount.py", line 604, in mkdirs
  | self.ssh("mkdir -p %s && chmod %o %s" % (path, mode, path))
  | paramiko.ssh_exception.SSHException: Unable to open channel.
  | Test requested 10 nodes, used only 7