Add active node stat to monitor.
Fix client.stop() bug.
Fix metastoreclient stop bug.
Change main.html picture title.
Change data to use more TreeMap for desc ordering.
Add offline/online device support; and node/fops plot.
modify databak to use jedis pool in STA mode
modify PhotoServer, the pool nerver shutdown
Merge remote-tracking branch 'origin/macan' into zhaoyang
display data in descending order by Set_Name