[MXNET-258] Improve flaky test_random.test_shuffle (#10313)
[MXNET-258] Improve flaky test_random.test_shuffle (#10313)

* Fix random seed for test_shuffle

* A Comment for the fixed seed is added

* Set random seed to reproduce the failure of test_random.test_shuffle

* Add a link to the github issue on the discussion for the fixed seed

* Testing with the failed random seed and increased number of samples

* Increase the number of samples instead of fixing the random seed for test_shuffle

* Increase the number of samples instead of fixing the random seed for test_shuffle

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