Autoactivate inactive users on external_auth login

Conditional on existing flag BYPASS_ACTIVATION_EMAIL_FOR_EXTAUTH
Merge pull request #3783 from edx/jbau/edx-west/jbau/shib-activate-on-acct-linking

    Autoactivate inactive users on external_auth login
Text Changes to Help Modal
Fixes third_party_auth tests by removing logout b4 login
Merge pull request #3801 from edx/jbau/edx-west/fix-thirdparty-tests

Jbau/edx west/fix thirdparty tests
update ORA2 version
help modal text and link changes