Checkpoint: tests for queued invite/reply (and fix reply).


git-svn-id: https://svn.calendarserver.org/repository/calendarserver@12468 e27351fd-9f3e-4f54-a53b-843176b1656c
Comply with distutils.version.StrictVersion().
Fixes #834.


git-svn-id: https://svn.calendarserver.org/repository/calendarserver@12469 e27351fd-9f3e-4f54-a53b-843176b1656c