The schema upgrades needed for the recent push notification changes


git-svn-id: https://svn.calendarserver.org/repository/calendarserver@11936 e27351fd-9f3e-4f54-a53b-843176b1656c
When upgrading, add "not null" to the priority column


git-svn-id: https://svn.calendarserver.org/repository/calendarserver@11937 e27351fd-9f3e-4f54-a53b-843176b1656c
No need to select pushID, which was there for debugging


git-svn-id: https://svn.calendarserver.org/repository/calendarserver@11938 e27351fd-9f3e-4f54-a53b-843176b1656c
Merge from trunk.


git-svn-id: https://svn.calendarserver.org/repository/calendarserver@11939 e27351fd-9f3e-4f54-a53b-843176b1656c
Adding missing yields


git-svn-id: https://svn.calendarserver.org/repository/calendarserver@11940 e27351fd-9f3e-4f54-a53b-843176b1656c
Fix the shutdown race condition within the notifier unit tests


git-svn-id: https://svn.calendarserver.org/repository/calendarserver@11941 e27351fd-9f3e-4f54-a53b-843176b1656c