reworking for Import/Export UI (#4128)

this commit includes the GUI to manage import/export/reset of SNMP, AM, User Scripts and Notification

scripts/lua/admin/manage_configurations.lua

@@ -0,0 +1,52 @@
+--
+-- (C) 2020 - ntop.org
+--
+local dirs = ntop.getDirs()
+package.path = dirs.installdir .. "/scripts/lua/modules/?.lua;" .. package.path
+package.path = dirs.installdir .. "/scripts/lua/modules/pools/?.lua;" .. package.path
+
+require "lua_utils"
+local page_utils = require "page_utils"
+local json = require "dkjson"
+local template_utils = require "template_utils"
+
+sendHTTPContentTypeHeader('text/html')
+
+if not haveAdminPrivileges() then return end
+
+-- The order key is used to set an order for the rendered list in the page
+local configuration_items = {
+    -- all = {key = "all", label = i18n("manage_configurations.everything"), order = 0 },
+    snmp = {key = "snmp", label = i18n("manage_configurations.snmp"), order = 1},
+    active_monitoring = {key = "active_monitoring", label = i18n("manage_configurations.active_monitoring"), order = 2},
+    scripts = {key = "scripts", label = i18n("manage_configurations.user_scripts"), order = 3},
+    notifications = {key = "notifications", label = i18n("manage_configurations.notifications"), order = 4},
+    -- {key = "pool_endpoint_recipients", label = i18n("manage_configurations.pool_endpoint_recipients")},
+}
+
+local selected_item = (table.has_key(configuration_items, _GET["item"]) and _GET["item"] or "snmp")
+
+page_utils.set_active_menu_entry(page_utils.menu_entries.manage_configurations)
+
+-- append the menu above the page
+dofile(dirs.installdir .. "/scripts/lua/inc/menu.lua")
+
+-- if the selected page is snmp but we aren't in pro version
+-- then block the user with an alert
+
+page_utils.print_page_title(i18n("manage_configurations.manage_configurations"))
+-- ************************************* ------
+
+
+print(template_utils.gen("pages/manage_configurations.template", {
+    template_utils = template_utils,
+    manage_configurations = {
+        selected_item = selected_item,
+        configuration_items = configuration_items,
+    }
+}))
+
+-- ************************************* ------
+
+-- append the footer below the page
+dofile(dirs.installdir .. "/scripts/lua/inc/footer.lua")