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


git-svn-id: 0c33e958600270102f91bf5868e396345dde476c@13941 e27351fd-9f3e-4f54-a53b-843176b1656c

red-hood/calendarserver,red-hood/calendarserver,red-hood/calendarserver,red-hood/calendarserver,red-hood/calendarserver,red-hood/calendarserver