Button to purge all role / ad cache

[rstolpe]

Summary of the new feature / enhancement

I want the possibility to purge all users role / ad cache for the psu server.
Today the role that are assigned or remove from a user takes a long time before it disappears from the user.
My guess it's because of the psu cache as it's the same for new roles and also when you remove a role from psu completely it the user are still having it according to $Roles

Proposed technical implementation details (optional)

No response

[adamdriscoll]

Related #3762