Yuan, Man

Results 3 issues of Yuan, Man

See discussions in #1253 and NVIDIA/nccl#324, CUDA IPCs cannot be established between docker containers with different GPU mount, which hurts NCCL performance in GPU cluster. Can nvidia-docker provides a capability...

In S3 filesystem, [virtual style is disabled](https://github.com/tensorflow/io/blob/master/tensorflow_io/core/filesystems/s3/s3_filesystem.cc#L173) for a corner case that '.' in the bucket name. But the deprecation of path style will [come eventually](https://aws.amazon.com/cn/blogs/aws/amazon-s3-path-deprecation-plan-the-rest-of-the-story/), and for some S3...