Implemented dummy interface (-i dummy) to be used only for debugging purposes for testing low-memory conditions and internal routines.

Updated scripts that were still using old API calls

scripts/lua/modules/lua_utils.lua

@@ -895,7 +895,7 @@ end
 
 -- Return the first 'howmany' hosts
 function getTopInterfaceHosts(howmany, localHostsOnly)
-  hosts_stats = interface.getHostsInfo()
+  hosts_stats,total = aggregateHostsStats(interface.getHostsInfo())
   ret = {}
   sortTable = {}
   n = 0