CLC-4075 Let Dev and QA both be able to get a Google refresh_token

https://jira.ets.berkeley.edu/jira/browse/CLC-4075

It's a long story, but a recent update of the Signet gem from 0.5.0 to 0.5.1 made it so that a single user can no longer persist a bConnected connection on more than one test server: Dev, QA, or localhost, but no more than that.

By restoring the old Signet behavior, we re-enable more than one active refresh_token.