1. new log file feature - when enabled, all debugs/error logs
   are printed in the global log file
2. 3 new api - for enabling/disabling debugs/logfile and reading
   file contents of logfile.
3. Makefile - make test
4. ut starter code. one testcase. pollthread_mgr.
New apis for logging and also tests for logging
Updated to use the dev_key in ofrw-info.