fix(agw): suppressed dual exception message

[VinashakAnkitAman]

Title

fix(agw): suppressed dual exception message

Summary

Some of the test cases were throwing unnecessary dual exceptions if timeout occurs while waiting for messages. This PR suppresses the dual exception messages by discarding exception chain

Example of unnecessary dual exception:

test_activate_deactivate_multiplededicated failed (2 runs remaining out of 3).Traceback (most recent call last):
          File "/home/vagrant/magma/lte/gateway/python/integ_tests/s1aptests/s1ap_utils.py", line 218, in get_response
            return self._msg.get(True, timeout)
          File "/usr/lib/python3.5/queue.py", line 172, in get
            raise Empty
        queue.Empty

        During handling of the above exception, another exception occurred:

        Traceback (most recent call last):
          File "/usr/lib/python3.5/unittest/case.py", line 59, in testPartExecutor
            yield
          File "/usr/lib/python3.5/unittest/case.py", line 601, in run
            testMethod()
          File "/home/vagrant/magma/lte/gateway/python/integ_tests/s1aptests/test_activate_deactivate_multiple_dedicated.py", line 114, in test_activate_deactivate_multiplededicated
            response = self._s1ap_wrapper.s1_util.get_response()
          File "/home/vagrant/magma/lte/gateway/python/integ_tests/s1aptests/s1ap_utils.py", line 224, in get_response
            + " sec) occurred while waiting for response message",
        AssertionError: Timeout (180 sec) occurred while waiting for response message

Suppressed excption:

test_activate_deactivate_multiplededicated failed (2 runs remaining out of 3).Traceback (most recent call last):
          File "/usr/lib/python3.5/unittest/case.py", line 59, in testPartExecutor
            yield
          File "/usr/lib/python3.5/unittest/case.py", line 601, in run
            testMethod()
          File "/home/vagrant/magma/lte/gateway/python/integ_tests/s1aptests/test_activate_deactivate_multiple_dedicated.py", line 114, in test_activate_deactivate_multiplededicated
            response = self._s1ap_wrapper.s1_util.get_response()
          File "/home/vagrant/magma/lte/gateway/python/integ_tests/s1aptests/s1ap_utils.py", line 225, in get_response
            ) from None

Test plan

Verified with sanity

Signed-off-by: VinashakAnkitAman ankit.aman@radisys.com

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[github-actions]

feg-workflow

    2 files  202 suites   38s ⏱️
371 tests 371 ✔️ 0 💤 0 ❌
385 runs  385 ✔️ 0 💤 0 ❌

Results for commit 777c348.

♻️ This comment has been updated with latest results.

[github-actions]

dp-workflow

18 tests   18 ✔️  4m 30s ⏱️
  2 suites    0 💤
  2 files      0 ❌

Results for commit 777c348.

♻️ This comment has been updated with latest results.

[github-actions]

agw-workflow

     78 files     123 suites   6m 42s ⏱️
1 152 tests 1 148 ✔️ 4 💤 0 ❌
1 154 runs  1 150 ✔️ 4 💤 0 ❌

Results for commit 777c348.

♻️ This comment has been updated with latest results.