Disable Sahi proxy method which remove the authorization header (e.g. Bearer Token)

[toschneck]

For some web application which use a construct like "Bearer Tokens" Sahi removes the authorization header and so break the tests: The website will continuously logout and are not controllable.

Example:

    _navigateTo("https://onlinerechner.contactm.de/b-os/");
    _highlight(_div("Produkt & Varianten auswählen"));

Like also discussed at Sahi Community - Authorization header getting stripped out this behavior is not wanted.

Solution:
Skip the execution of the action HttpRequest.removeHeader("Authorization")

Tasks:

• Add a advice to Sakuli to skip the execution if removeHeader will be called with the value "Authorization"
• Add the property sahi.proxy.removeAuthorizationHeader.enabled: is set to true like the default behavior of sahi (We don't know the impact on other applications)
• Add a documentation page like "Know Sahi Issues"