Adding the necessary variables to configure OAuth2 Client

[Alec4r]

These changes fix the next two issues:

• The login isn't working because some variables wasn't defined, so always the login redirect to http://127.0.0.1:8000, these variables were hardcoded in the file analytics_dashboard/settings/base.py

• In the file /edx/etc/insights.yml the variabels are defined with the prefix "INSIGHTS_" and that isn't working because We are expecting the variables without the prefix.

reviewers:
@morenol

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[morenol]

This looks good to me, I think that we should add this to Juniper once this gets merged to master.

CC (@nedbat)

[nedbat]

Ping me again when this merges.

[natabene]

@Alec4r Thank you for your contribution! I will line this up for our review.

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@Alec4r 🎉 Your pull request was merged!

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[morenol]

Hi @nedbat, could we cherry-pick this into juniper.master?

[nedbat]

Yikes! Somehow I missed this comment. Would it still be useful to have this in Juniper?

[morenol]

I think that it could be useful for the Juniper installations, but since that release is not longer supported we can just keep it without this change.