twitter: use HTTPS for OAuth
twitter: use HTTPS for OAuth

fixes CNVS-10521

Twitter now requires SSL. See their announcement:
https://dev.twitter.com/discussions/24239

test plan:
  * create a test application at dev.twitter.com
  * enable the Twitter plugin with your test key
  * go to a user profile page and enable Twitter integration
  * verify that Twitter is added successfully

Change-Id: I918f1658d27af0c987b33d99320df7e72cbe01ba
Reviewed-on: https://gerrit.instructure.com/28884
Reviewed-by: Braden Anderson <a6cc2cef7d25f27847876bdb81651755fcebacf0@instructure.com>
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>
QA-Review: Matt Fairbourn <5f353e1c97bb9cc046b9db20beca0b9392f6f1b2@instructure.com>
Product-Review: Braden Anderson <a6cc2cef7d25f27847876bdb81651755fcebacf0@instructure.com>

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