If IMIP was enabled and then disabled, turn off polling when the already existing work item fires.


git-svn-id: https://svn.calendarserver.org/repository/calendarserver@13941 e27351fd-9f3e-4f54-a53b-843176b1656c
Fix issue with group reconciliation when an attendee is removed as a member of one group but is still a member of another.


git-svn-id: https://svn.calendarserver.org/repository/calendarserver@13942 e27351fd-9f3e-4f54-a53b-843176b1656c