* libs/luci: implement get_list() and set_list() wrappers in luci.model.uci

libs/uci/luasrc/model/uci.lua

@@ -135,6 +135,36 @@ function tset(config, section, values)
 	return stat
 end
 
+--- Get an option or list and return values as table.
+-- @param config	UCI config
+-- @param section	UCI section name
+-- @param option	UCI option
+-- @return			UCI value
+function get_list(config, section, option)
+	if config and section and option then
+		local val = get(config, section, option)
+		return ( type(val) == "table" and val or { val } )
+	end
+	return nil
+end
+
+--- Set given values as list.
+-- Warning: This function is unsave! You should use save_config or save_state if possible.
+-- @param config	UCI config
+-- @param section	UCI section name
+-- @param option	UCI option
+-- @param value		UCI value
+-- @return			Boolean whether operation succeeded
+function set_list(config, section, option, value)
+	if config and section and option then
+		return set(
+			config, section, option,
+			( type(value) == "table" and value or { value } )
+		)
+	end
+	return false
+end
+
 
 --- Add an anonymous section.
 -- @class function