Redirect to /user/logout when user logs out in the UI: Force server logout.

Summary:
- Redirect to /user/logout when user logs out in the UI: Force server logout.
- Hack jso2 to reduce the timeout before redirecting to oauth/authorize. Reduce timeout to a sane value that feels almost instant instead of
weirdly laggy

Test Plan:
- Log in to UI
- Log out again
- See that browser is redirected to /user/logout
- See that log in was much faster than before

Reviewers: shadowhand, eyedol

Reviewed By: eyedol

Maniphest Tasks: T149

Differential Revision: https://phabricator.ushahidi.com/D22