SlingAuthenticator ignores the path

As per Sling documentation [0]
"When looking for an AuthenticationHandler the authentication handler is selected whose path is the longest match on the request URL."

This is currently broken due incorrect handling of

request.getPathInfo()

in SlingAuthenticator#getHandlerSelectionPath

[0] https://sling.apache.org/documentation/the-sling-engine/authentication/authentication-authenticationhandler.html