Allow anonymous access to /bin/loadbalancer

Access to /bin/loadbalancer on CQ Author requires authentication; this makes for more difficult integration by Network teams. Access to loadbalancer servlet by anonymous seems benign, and could be blocked from "normal internal traffic" by dispatcher.

Request to enable anonymous access to /bin/loadbalancer using Servlet @Property:

`@Property(name = "sling.auth.requirements", value = "-/bin/loadbalancer", propertyPrivate=true)`