PYTHON/PYTHONPATH cleanup


git-svn-id: https://svn.calendarserver.org/repository/calendarserver@13376 e27351fd-9f3e-4f54-a53b-843176b1656c
Build virtualenv when needed.


git-svn-id: https://svn.calendarserver.org/repository/calendarserver@13377 e27351fd-9f3e-4f54-a53b-843176b1656c
clean up


git-svn-id: https://svn.calendarserver.org/repository/calendarserver@13378 e27351fd-9f3e-4f54-a53b-843176b1656c
clean up more


git-svn-id: https://svn.calendarserver.org/repository/calendarserver@13379 e27351fd-9f3e-4f54-a53b-843176b1656c
Make sure purging of missing users correctly does implicit scheduling.


git-svn-id: https://svn.calendarserver.org/repository/calendarserver@13380 e27351fd-9f3e-4f54-a53b-843176b1656c