Ready UGA OpenAthens Go Live

UGA OpenAthens Go Live is tentatively 2020-Dec-21 (Monday)

We currently use OpenAthens (UGA SSO CAS) to log UGA users in to GALILEO. But we don't (yet) use OpenAthens to route users to vendor resources.

After Go Live, we need to change how we handle UGA. Instead of special-casing the uga1 inst code, we need to let UGA fall into line with other OpenAthens live institutions. So just the openathens: true boolean in the galileo_admin institution record should be all we check (like other institutions).

Then we'll not only use OpenAthens to log UGA users in to GALILEO, but we'll also use OpenAthens to route users to vendor resources.

There are pertinent TODO's in the files below. These may or may not be the only changes needed.

• homepage_controller.rb
• sessions_controller.rb
• welcome_controller.rb
• application_helper.rb
• open_athens_strategy.rb