[ROCm] Fix for ROCm CSB breakage - 201102
[ROCm] Fix for ROCm CSB breakage - 201102

The following commit introduces a new subtest ( `testThreeNestWithLists` within `//tensorflow/python/kernel_tests:while_v2_test_gpu` ), which fails with the following error on ROCm platform

https://github.com/tensorflow/tensorflow/commit/07b75ffa453b1ec9189371244d21b6684503340b

```
======================================================================
FAIL: testThreeNestWithLists (__main__.WhileV2Test)
testThreeNestWithLists (__main__.WhileV2Test)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/root/.cache/bazel/_bazel_root/efb88f6336d9c4a18216fb94287b8d97/execroot/org_tensorflow/bazel-out/k8-opt/bin/tensorflow/python/kernel_tests/while_v2_test_gpu.runfiles/org_tensorflow/tensorflow/python/kernel_tests/while_v2_test.py", line 291, in testThreeNestWithLists
    self.assertAllClose(numerical, theoretical, rtol=1e-3)
  File "/root/.cache/bazel/_bazel_root/efb88f6336d9c4a18216fb94287b8d97/execroot/org_tensorflow/bazel-out/k8-opt/bin/tensorflow/python/kernel_tests/while_v2_test_gpu.runfiles/org_tensorflow/tensorflow/python/framework/test_util.py", line 1236, in decorated
    return f(*args, **kwds)
  File "/root/.cache/bazel/_bazel_root/efb88f6336d9c4a18216fb94287b8d97/execroot/org_tensorflow/bazel-out/k8-opt/bin/tensorflow/python/kernel_tests/while_v2_test_gpu.runfiles/org_tensorflow/tensorflow/python/framework/test_util.py", line 2711, in assertAllClose
    self._assertAllCloseRecursive(a, b, rtol=rtol, atol=atol, msg=msg)
  File "/root/.cache/bazel/_bazel_root/efb88f6336d9c4a18216fb94287b8d97/execroot/org_tensorflow/bazel-out/k8-opt/bin/tensorflow/python/kernel_tests/while_v2_test_gpu.runfiles/org_tensorflow/tensorflow/python/framework/test_util.py", line 2651, in _assertAllCloseRecursive
    (path_str, path_str, msg))
  File "/root/.cache/bazel/_bazel_root/efb88f6336d9c4a18216fb94287b8d97/execroot/org_tensorflow/bazel-out/k8-opt/bin/tensorflow/python/kernel_tests/while_v2_test_gpu.runfiles/org_tensorflow/tensorflow/python/framework/test_util.py", line 2606, in _assertArrayLikeAllClose
    a, b, rtol=rtol, atol=atol, err_msg="\n".join(msgs), equal_nan=True)
  File "/usr/local/lib/python3.6/dist-packages/numpy/testing/nose_tools/utils.py", line 1396, in assert_allclose
    verbose=verbose, header=header, equal_nan=equal_nan)
  File "/usr/local/lib/python3.6/dist-packages/numpy/testing/nose_tools/utils.py", line 779, in assert_array_compare
    raise AssertionError(msg)
AssertionError:
Not equal to tolerance rtol=0.001, atol=1e-06
Mismatched value: a is different from b.
not close where = (array([0]), array([0]), array([0]))
not close lhs = [-0.16975401]
not close rhs = [-0.1699624]
not close dif = [0.00020839]
not close tol = [0.00017096]
dtype = float32, shape = (1, 1, 1)
(mismatch 100.0%)
 x: array([[[-0.169754]]], dtype=float32)
 y: array([[[-0.169962]]], dtype=float32)

----------------------------------------------------------------------
Ran 70 tests in 16.568s

FAILED (failures=1, skipped=2)
================================================================================
```

The commit fixes the subtest on the ROCm platform by slightly relaxing the error tolerance (1e-3 to 3e-3)

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