[BUGFIX] [1.x] Backport of "Avoid logging seed for skipped tests #19322"

[DickJC123]

Description

This fixes issue #19255, where it was noted that when a unittest was skipped, the skip-exception caused the with_seed() decorator to log the seed. While the 1.x branch uses nosetests, not pytest, the same behavior is seen on 1.x. With this PR the seed is no longer logged.

This PR doesn't have any testing added- I will inspect the CI log for skipped tests such as test_operator.py:test_activation to verify that the seed logging has been successfully eliminated.

@leezu @samskalicky

Checklist

Essentials

• [X ] PR's title starts with a category (e.g. [BUGFIX], [MODEL], [TUTORIAL], [FEATURE], [DOC], etc)
• [X ] Changes are complete (i.e. I finished coding on this PR)
• All changes have test coverage
• [X ] Code is well-documented

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[DickJC123]

I can verify the PR has fixed the problem. In the centos-cpu log of this PR:

[2020-10-10T02:44:13.929Z] test_operator.test_rnn_with_new_param ... ok (0.1284s)
[2020-10-10T02:44:13.929Z] test_operator.test_activation ... SKIP: test fails intermittently. temporarily disabled till it gets fixed. tracked at https://github.com/apache/incubator-mxnet/issues/13915
[2020-10-10T02:44:13.929Z] test_operator.test_laop_6 ... SKIP: Test crashes https://github.com/apache/incubator-mxnet/issues/15975
[2020-10-10T02:44:13.929Z] test_operator.test_sequence_last ... SKIP: Flaky test: https://github.com/apache/incubator-mxnet/issues/11395
[2020-10-10T02:44:28.755Z] test_operator.test_lstm_sym ... /work/mxnet/python/mxnet/rnn/rnn_cell.py:674: UserWarning: NTC layout detected. Consider using TNC for FusedRNNCell for faster speed

while in a log from an early 1.x PR #19296 without this fix:

[2020-10-06T02:22:39.700Z] test_operator.test_rnn_with_new_param ... ok (0.1109s)
[2020-10-06T02:22:39.700Z] test_operator.test_activation ... [WARNING] Error seen with seeded test, use MXNET_TEST_SEED=1946711394 to reproduce.
[2020-10-06T02:22:39.700Z] Error seen with seeded test, use MXNET_TEST_SEED=1946711394 to reproduce.
[2020-10-06T02:22:39.700Z] SKIP: test fails intermittently. temporarily disabled till it gets fixed. tracked at https://github.com/apache/incubator-mxnet/issues/13915
[2020-10-06T02:22:39.700Z] test_operator.test_laop_6 ... [WARNING] Error seen with seeded test, use MXNET_TEST_SEED=2941211 to reproduce.
[2020-10-06T02:22:39.700Z] Error seen with seeded test, use MXNET_TEST_SEED=2941211 to reproduce.
[2020-10-06T02:22:39.700Z] SKIP: Test crashes https://github.com/apache/incubator-mxnet/issues/15975
[2020-10-06T02:22:39.700Z] test_operator.test_sequence_last ... [WARNING] Error seen with seeded test, use MXNET_TEST_SEED=1784308719 to reproduce.
[2020-10-06T02:22:39.700Z] Error seen with seeded test, use MXNET_TEST_SEED=1784308719 to reproduce.
[2020-10-06T02:22:39.700Z] SKIP: Flaky test: https://github.com/apache/incubator-mxnet/issues/11395
[2020-10-06T02:22:54.544Z] test_operator.test_lstm_sym ... /work/mxnet/python/mxnet/rnn/rnn_cell.py:674: UserWarning: NTC layout detected. Consider using TNC for FusedRNNCell for faster speed