Convert system metrics into float

Prior to this commit, the system metrics values were strings. This
commit changes them to be floats. This adds compatibility with the
existing json2timeseries parsing script as it looks for numeric values.

Author: Jarret Lavallee

files/generate_system_metrics

@@ -109,7 +109,8 @@ module SystemMetrics
       #combine the arrays into a hash starting from the deal with the unmatched columns in the front
       data_hash = Hash[headers_line.reverse.zip(averages_line.reverse).reverse]
       # remove anything that doesn't have a number for an average like "Average:" or "all"
-      data_hash.select{ |k,v| v =~ /\A[-+]?[0-9]*\.?[0-9]+\Z/ }
+      data_hash.select!{ |k,v| v =~ /\A[-+]?[0-9]*\.?[0-9]+\Z/ }
+      data_hash.transform_values!(&:to_f)
     end
 
     # Convert the inputted sar output into json and raise errors if the sar output is invalid