[system] add proxy support for packaging updates through Internet
[farms] fix leastconns traffic to down backends
[farms] fix HTTP traffic forwarding when cookie insertion was enabled
[guardian] fix farm guardian doesn’t start up properly
[webgui] fix farm guardian processes were killed if the web GUI was stopped
[webgui] fix memory leaks in the web GUI server
[webgui] a different network interface can be configured if the cluster is enabled.