Skip the failing unit tests from the FusedRMSNorm PR

[hubertlu-tw]

FusedRMSNorm PR: #78
The failed unit tests which were skipped in this PR: #78 (comment)

[hubertlu-tw]

The two failing tests in the CI checks are both flaky tests.

rocm-pytorch-master

FAIL: test_loss_scale_decrease (test_checkpointing.TestCheckpointing)
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Traceback (most recent call last):
  File "/apex/tests/L0/run_amp/test_checkpointing.py", line 212, in test_loss_scale_decrease
    self.assertEqual(update_ls, init_ls / 2**factor)
AssertionError: 32768.0 != 16384.0

rocm-pytorch-release

FAIL: test_layer_norm (test_fused_layer_norm.TestFusedLayerNormElemWiseBFloat16) (contiguous=True)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/apex/tests/L0/run_fused_layer_norm/test_fused_layer_norm.py", line 69, in _test_same_output
    self._check_same_output(batch_size, contiguous)
  File "/apex/tests/L0/run_fused_layer_norm/test_fused_layer_norm.py", line 62, in _check_same_output
    out_cpu_.to(device="cuda", dtype=self.dtype), out_cuda_, **self.fwd_thresholds)
  File "/opt/conda/lib/python3.7/site-packages/torch/testing/_deprecated.py", line 32, in inner_wrapper
    return_value = fn(*args, **kwargs)
  File "/opt/conda/lib/python3.7/site-packages/torch/testing/_deprecated.py", line 89, in assert_allclose
    msg=msg or None,
  File "/opt/conda/lib/python3.7/site-packages/torch/testing/_comparison.py", line 1321, in assert_close
    msg=msg,
  File "/opt/conda/lib/python3.7/site-packages/torch/testing/_comparison.py", line 1074, in assert_equal
    raise error_metas[0].to_error()
AssertionError: Tensor-likes are not close!

Mismatched elements: 1 / 8192 (0.0%)
Greatest absolute difference: 0.0006103515625 at index (8, 12, 10) (up to 0.0003 allowed)
Greatest relative difference: 0.03546099290780142 at index (8, 12, 10) (up to 0.016 allowed)

[jithunnair-amd]

Just to elaborate, based on offline discussion, the above two tests are flaky even on upstream Apex.