[EAP7] Configure proxy-address-forwarding="true" by default so that HttpServletRequest.getRemoteHost() returns client IP address instead of the OpenShift HAProxy router address

Feature: proxy-address-forwarding is now enabled by default in standalone-openshift.xml Reason: HTTP requests to EAP instance typically go via OpenShift HAProxy Router. Calling HttpServletRequest.getRemoteHost in this case would return the address of the HAProxy router, instead of the original client Result: HttpServletRequest.getRemoteHost() now returns the IP address of the original client for HTTP requests going via OpenShift HAProxy