Add support for trial's --until-failure option and make random the default adding a -o option for specifying 'Ordered execution'
Add support for trial's --until-failure option and make random the default adding a -o option for specifying 'Ordered execution'

git-svn-id: 81e381228600e5752b80483efd2b45b26c451ea2@1384 e27351fd-9f3e-4f54-a53b-843176b1656c

trevor/calendarserver,trevor/calendarserver,trevor/calendarserver