Fix pylint sanity error for CI build

Fix pylint sanity error for CI build

The CI build is failing, caused by:
```
53 FAIL: Found 4 non-whitelited pylint errors:
54 tensorflow/python/ops/sparse_ops.py:87: [C0301(line-too-long), ] Line too long (94/80)
55
56 tensorflow/python/ops/sparse_ops.py:594: [C0301(line-too-long), ] Line too long (92/80)
57
58 tensorflow/python/ops/array_ops.py:2622: [C0301(line-too-long), ] Line too long (92/80)
59
60 tensorflow/python/ops/array_ops.py:2623: [C0301(line-too-long), ] Line too long (98/80)
```

This fix fixes the sanity pylint error.

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>