Pass an email of an authorized user to backends.

[wrr]

When a user is authorized, wwwhisper can return the user's email in HTTP header. Nginx can then pass the email to backends. Such setup will likely require HttpHeadersMore module.

[wrr]

This is implemented in 01d1f1e wwwhisper returns an email of authenticated user in a 'User' header which can be then passed to backends. If client tries to pass the 'User' header by itself, an error is returned.

wrr/wwwhisper-openshift@a5a1ffd and wrr/wwwhisper-openshift@fed6fef demonstrate how the feature can be used. Gollum wiki author info is populated based on 'User' header passed from the wwwhisper.