The smartctl output can vary based on the localization set in Windows.
This means that some numbers can show up comma-seperated (english),
space seperated, or even apostrophe seperated. There are probably
others.

This updates one function that was always assuming comma seperated to
remove any non-numeric value and no longer split on white space, which
could be used as a seperator.

Fixes: influxdata#10907

This removes any non-utf8 values in strings, like whitespace charachters
(e.g. \x92 or \xa0) as well as removes whitespace or commas that are
sometimes used in the parsing of values.