Initial checkin for contrail storage stats daemon
    1. provisioning changes added
    2. added unit tests
    3. renamed/restructured SConscript files
    4. restructured setup.py
    5. added stats-daemon.conf
    6. added test packages in SConscript
    7. modified storage_nodemgr.py based on review comments
    8. added latency changes in  storage-nodemgr.py
    9. added diff logic for read/write bytes/counts for gui
    10. Changed DEFAULT to DEFAULTS during provisioning

Change-Id: Ic6540ddd8e613ad530f4204526659560bcfc0a7d
Merge "    Initial checkin for contrail storage stats daemon     1. provisioning changes added     2. added unit tests     3. renamed/restructured SConscript files     4. restructured setup.py     5. added stats-daemon.conf     6. added test packages in SConscript     7. modified storage_nodemgr.py based on review comments     8. added latency changes in  storage-nodemgr.py     9. added diff logic for read/write bytes/counts for gui     10. Changed DEFAULT to DEFAULTS during provisioning" into R1.10