Merge pull request #131 from Juniper/R2.0

Average BW for scatter chart merge to masterR2.0
Closed Bug #1393994

Implemented the backgrounds jobs to cache OSDs, Storage Node and Tree data
Individual details will read/retrive from cached objects
Merge pull request #132 from surakula/master

Closed Bug #1393994
Merge pull request #133 from Juniper/master

Close Bugs# 1389448 Merge to R2.0