Bring back S3_VERIFY_SSL environment variable

[fsonntag]

#1343 removed the environment variable S3_VERIFY_SSL.

Even though it's discouraged to disable SSL verification, it is still useful to do so in development environments. So it would be great to bring this back.

[google-cla]

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[fsonntag]

@yongtang Can you take a look at this? Would be great to have this functionality back :)

[yongtang]

@fsonntag thanks for the contribution - can you sign the CLA as was shown ?

[fsonntag]

@fsonntag thanks for the contribution - can you sign the CLA as was shown ?

@yongtang I'm sorry, but I already signed it and the CI seems to show the CLA check as passing. Or do I misunderstand it?

[fsonntag]

@yongtang Is it possible to push this through? :) I think the failed CI is not related to this change!

[yatbear]

Hi tensorflow-io team,

Since this fix isn't incorporated in the latest pip version nor the nightly (last candidate was from March). When will the next pip release happen? Are there any plans to fix the nightly soon? Thanks!

[fsonntag]

@yongtang Yep, would be great if we can get a nightly with this sooooon. I realize the issue is the broken CI pipeline.

I sent an MR fixing the Linux one here: #1797

But I don't really know how to fix the Windows one... is it maybe possible to manually publish a nightly release? :)

[yingding]

I need this on my Kubeflow on-prem production environment. I got some issue to use tensorflow-io with an on-prem minio s3 bucket. Please bring back the S3_VERIFY_SSL env setting asap.