Merge pull request #2134 from chikoon/CLC-3214-deep-linking

CLC-3125-deep-linking - Third try
CLC-3125-deep-linking - Third revert

https://jira.media.berkeley.edu/jira/browse/CLC-3125

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