Allow overloading ContextListener::refreshUser()
feature #10792 [Security] Allow overloading ContextListener::refreshUser() (lstrojny)

This PR was merged into the 2.6-dev branch.

Discussion
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[Security] Allow overloading ContextListener::refreshUser()

Allow overloading refreshUser() for the use case of doing something special with user providers.

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | n.A.
| License       | MIT
| Doc PR        | n.A.

Commits
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b67ed43 Allow overloading ContextListener::refreshUser()