Move syslog producer list to rest API

scripts/lua/rest/v2/get/syslog/producer/list.lua

@@ -0,0 +1,25 @@
+--
+-- (C) 2019-22 - ntop.org
+--
+
+local dirs = ntop.getDirs()
+package.path = dirs.installdir .. "/scripts/lua/modules/?.lua;" .. package.path
+
+require "lua_utils"
+local json = require("dkjson")
+local syslog_utils = require "syslog_utils"
+
+sendHTTPContentTypeHeader('application/json')
+
+local res = {}
+
+local ifid = interface.getId()
+if tonumber(_GET["ifid"]) ~= nil then
+  ifid = _GET["ifid"]
+end
+
+if ifid ~= nil then
+  res = syslog_utils.getProducers(ifid)
+end
+
+print(json.encode(res))