Update notes for submitted changes

* Initial checkin for contrail storage stats daemon [ review changes ] 1. added unit tests 2. renamed/restructured SConscript files 3. restructured setup.py 4. added stats-daemon.conf 5. added test packages in SConscript 6. modified storage_nodemgr.py based on review comments 7. added latency changes 8. added diff logic for read/write bytes/counts for gui 9. storage package added in alphabetical order 10. #common is removed from requirements.txt 11. default values are #'d in stats-daemon.conf 12. big functions are modified to sub function calls in nodemgr.py 13. argument parsing in nodemgr.py is done using argparse 14. more unit test cases added in test_storage_nodemgr.py 15. indentation done in nodemgr.py 16. storage node mgr name changed to storage stats mgr 17. entry point added in setup.py 18. removed stderr logging 19. try-except removed in storage-nodemgr.py for importing     sandesh files 20. storage.sandesh disk name removed and uuid added similar     to osd structure. 21. added (tags="") empty tag in storage.sandesh Change-Id: Id78a11da6d9f89cf46da8236136d0b758f3ebf01