Removed MUD implementation obsoleted by the service map

Fixes #4326
Fixes 3499

scripts/lua/rest/get/host/mud.lua

@@ -1,30 +0,0 @@
---
--- (C) 2019-20 - ntop.org
---
-
-local dirs = ntop.getDirs()
-package.path = dirs.installdir .. "/scripts/lua/modules/?.lua;" .. package.path
-require "lua_utils"
-local mud_utils = require("mud_utils")
-local json = require("dkjson")
-
-local host = _GET["host"]
-
-if(_GET["ifid"] ~= nil) then
-  interface.select(_GET["ifid"])
-end
-
-sendHTTPHeader('application/json')
-
-if(host == nil) then
-  print("{}")
-  return
-end
-
-local mud = mud_utils.getHostMUD(host)
-
-if(mud ~= nil) then
-  print(json.encode(mud, {indent=true}))
-else
-  print("{}")
-end