Common auditing log API and facilities

Auditing logs are to be written to record authentication events, authorization events, and resource consuming events. The scope:

• Define auditing log properties, format and the required fields/info to be written down;
• Define auditing log writer API with various log writing strategies;
• Implement simple auditing log writer based on local log files;
• Define API to register customized auditing log writer, to get the activated auditing log writer configured for the system.