Remove gluon.utils.download copy with verify_ssl support

[leezu]

Description

The problematic server now servers a valid SSL certificate. Also apache/mxnet#11546 will add the option upstream.

Checklist

Essentials

• Changes are complete (i.e. I finished coding on this PR)
• All changes have test coverage
• Code is well-documented

Changes

Comments

[szha]

We will need to wait until we update the dependency with a nightly version that includes the update in download before we merge.

[leezu]

Currently the updated download is not needed any more, because the third-party server was fixed. I proposed the change in mxnet as we may run into similar issues in future.

[leezu]

It turns out the webserver is still not fixed. The issue is that it does not serve an intermediary certificate that is needed to establish the trust from the root CA to the websites certificate. Newer browsers include the intermediary certificate used, so no error is shown when accessing the file with Firefox.

I have contacted the admin and asked to include the intermediary certificates. More info about the certificate issues can be found here https://www.ssllabs.com/ssltest/analyze.html?d=ie.technion.ac.il

[codecov]

Codecov Report

Merging #193 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #193   +/-   ##
=======================================
  Coverage   67.84%   67.84%           
=======================================
  Files          72       72           
  Lines        7109     7109           
=======================================
  Hits         4823     4823           
  Misses       2286     2286

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[mli]

Job PR-193/16 is complete.
Docs are uploaded to http://gluon-nlp-staging.s3-accelerate.dualstack.amazonaws.com/PR-193/16/index.html

[szha]

@leezu it passed. Was the issue upstream fixed?

[leezu]

No, I made use of the verify_ssl=False that was added to upstream mxnet.

[leezu]

I haven't received a response from the webmaster. They seem unwilling to fix their server.