Massive cleanup of flow user scripts into callback_definitions

scripts/lua/modules/callback_definitions/flow/not_purged.lua

@@ -0,0 +1,32 @@
+--
+-- (C) 2019-21 - ntop.org
+--
+
+local user_scripts = require("user_scripts")
+local alerts_api = require "alerts_api"
+local alert_severities = require "alert_severities"
+local alert_consts = require("alert_consts")
+local flow_alert_keys = require "flow_alert_keys"
+
+-- #################################################################
+
+local script = {
+   -- Script category
+   category = user_scripts.script_categories.internals,
+
+   -- This script is only for alerts generation
+   alert_id = flow_alert_keys.flow_alert_internals,
+
+   default_value = {
+      severity = alert_severities.error,
+   },
+
+   gui = {
+      i18n_title = "flow_callbacks_config.not_purged",
+      i18n_description = "flow_callbacks_config.not_purged_description",
+   }
+}
+
+-- #################################################################
+
+return script