More useful logging for WPT issues. (#1712)
More useful logging for WPT issues. (#1712)

Log on warning level instead of error level for issues retrieving data from WPT. It’s not an error in sitespeed, so error is to severe. Additionally make the logging more useful by:
* not adding a stack trace to each log statement
* including the page url for each log statement
* fix some spelling errors in logging.
beenanner/sitespeed.io,sitespeedio/sitespeed.io,sitespeedio/sitespeed.io,beenanner/sitespeed.io,beenanner/sitespeed.io,sitespeedio/sitespeed.io,sitespeedio/sitespeed.io