Should handle Counter64 metrics to get correct usage of high-speed network

[datacrat]

Currently, nwuCollect.sh polls ifInOctets/ifOutOctets, which are Counter32 and easily be circulated in high speed networks with long poll intervals.
Need to collect and calculate ifHCInOctets/ifHCOutOctets.

Counter32: 0..4294967295(2^32-1)

• 10Mbps: circulated in 3,436 sec
• 100Mbps: circulated in 344 sec
• 1Gbps: circulated in 34 sec

Counter64: 0..18446744073709551615(2^64-1)

• 1Gbps: circulated in 147,573,952,590 sec
• 10Gbps: circulated in 14,757,395,259 sec
• 100Gbps: circulated in 1,475,739.526 sec (~17,000 days)