Currently we are getting the bandwidth usage as SUM of last one hour from opserver which is supposed to be current usage,bug id 1355036
Fix:We are calculating the average eg:SUM(if_stats.out_bw_usage)/COUNT(if_stats) and displaying it.

Change-Id: I887167d9b28f66144dff929a73dde83cf851c20b
Merge "Currently we are getting the bandwidth usage as SUM of last one hour from opserver which is supposed to be current usage,bug id 1355036 Fix:We are calculating the average eg:SUM(if_stats.out_bw_usage)/COUNT(if_stats) and displaying it."