[2.3] - Added ability to "wipe" a user session data without killing the session

Since i'm far from being a session master, feedback are more than welcome.

### What does it do ?

Adds ability to "refresh" a user session without logging-out the user.

### Why is it needed ?

Session data (ie. contexts accesses) being stored at "logging", a user must log-out first to regenerate the data.
This could potentially be used when some changes are made to user/group settings.

### Related issue(s)/PR(s)

Should fix #11247