python_SUITE: Increase unittest verbosity

[Why]
I noticed the following error in a test case:

    error sending frame
    Traceback (most recent call last):
      File "/home/runner/work/rabbitmq-server/rabbitmq-server/deps/rabbitmq_stomp/test/python_SUITE_data/src/deps/stomp/transport.py", line 623, in send
        self.socket.sendall(encoded_frame)
    OSError: [Errno 9] Bad file descriptor

When the test suite succeeds, this error is not present. When it failed,
it was present. But I checked only one instance of each, it's not enough
to draw any conclusion about the relationship between this error and the
failing test case later.

I have no idea which test case hits this error, so increase the
verbosity, in the hope we see the name of the test case running at the
time of this error.

Author: dumbbell

deps/rabbitmq_stomp/test/python_SUITE_data/src/test_runner.py

@@ -20,7 +20,7 @@ def run_unittests(modules):
             if name.startswith("Test") and issubclass(obj, unittest.TestCase):
                 suite.addTest(unittest.TestLoader().loadTestsFromTestCase(obj))
 
-    ts = unittest.TextTestRunner().run(unittest.TestSuite(suite))
+    ts = unittest.TextTestRunner(verbosity=10).run(unittest.TestSuite(suite))
     if ts.errors or ts.failures:
         sys.exit(1)