CLC-3215-deep-linking - Third revert

https://jira.ets.berkeley.edu/jira/browse/CLC-3215

Reverted changes again.  Passing :url to /auth/cas fails on
Calcentral-dev, still giving an invalid_ticket message:

https://calcentral-dev.berkeley.edu/auth/failure?message=invalid_ticket&strategy=cas
Merge pull request #2139 from chikoon/CLC-3214-deep-linking

CLC-3215-deep-linking - Third revert