EUCA-5682 certain metrics ending in the word Total ended up in list metrics and only had one metric value associated with them.

This fixes that issue, by creating a 'metricsToAdd' list in MetricDataQueue.java, allowing intial absolute metrics to be put
in the absolute_metric_history table.
This fix
a) Removed "first" (or bad) data points from absolute metrics
b) Added "Disk(Read/Write)(Ops/Bytes)" EC2 metrics to the absolute list
c) Added "Network(In/Out)" EC2 metrics to the absolute list, separated out
   Network(In/Out)External, handled it in Cloudwatch
d) Added weights to time differences (by adding samplecount, as amazon does)
e) Rejected earlier data points, and dealt with NC resets
Merge branch 'dev/ethomas/EUCA-5682-squash' into testing