Running behind a proxy

[liujunhui2]

When running behind a proxy, the setup will fail because the containers cannot obtain certificates with curl.
A solution is provided.

[googlebot]

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[liujunhui2]

I signed it!

2016-06-02 11:49 GMT+08:00 googlebot notifications@github.com:

Thanks for your pull request. It looks like this may be your first
contribution to a Google open source project. Before we can look at your
pull request, you'll need to sign a Contributor License Agreement (CLA).

📝 Please visit https://cla.developers.google.com/
https://cla.developers.google.com/ to sign.

Once you've signed, please reply here (e.g. I signed it!) and we'll

verify. Thanks.

• If you've already signed a CLA, it's possible we don't have your
  GitHub username or you're using a different email address. Check your
  existing CLA data https://cla.developers.google.com/clas and verify
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[googlebot]

CLAs look good, thanks!

[pwittrock]

@vishh Do you have time to look at this?