Log parser gt 1hr

Fixed the regexes to be less fragile.  
Added tests to catch the >= 1hr scenario.  
updated old tests with slight variation in duration (we were keeping many decimal places of a second, which we would never use)
Hey Ed--  Jeads had mentioned something similar.  I updated that regex to be a little more specific: https://github.com/mozilla/treeherder-service/blob/master/treeherder/log_parser/parsers.pyx#L66-66