Enable proxy-address-forwarding for Undertow http listener

From Undertow docs (https://docs.jboss.org/author/display/WFLY8/Undertow+(web)+subsystem+configuration):

"If this is enabled then the X-Forwarded-For and X-Forwarded-Proto headers will be used to determine the peer address. This allows applications that are behind a proxy to see the real address of the client, rather than the address of the proxy."