Lower the log level of work queue scheduling messages


git-svn-id: https://svn.calendarserver.org/repository/calendarserver@13950 e27351fd-9f3e-4f54-a53b-843176b1656c
Don't just ignore "server down" and generic LDAP exceptions.


git-svn-id: https://svn.calendarserver.org/repository/calendarserver@13951 e27351fd-9f3e-4f54-a53b-843176b1656c
Handle directory-based delegation to groups which don't actually exist.


git-svn-id: https://svn.calendarserver.org/repository/calendarserver@13952 e27351fd-9f3e-4f54-a53b-843176b1656c
Test for proper EXDATE removal after attendee re-invited to overridden instance.


git-svn-id: https://svn.calendarserver.org/repository/calendarserver@13953 e27351fd-9f3e-4f54-a53b-843176b1656c
Proper EXDATE removal after attendee re-invited to overridden instance.


git-svn-id: https://svn.calendarserver.org/repository/calendarserver@13954 e27351fd-9f3e-4f54-a53b-843176b1656c
Test for proper EXDATE removal after attendee re-invited to overridden instance.


git-svn-id: https://svn.calendarserver.org/repository/calendarserver@13955 e27351fd-9f3e-4f54-a53b-843176b1656c
Proper EXDATE removal after attendee re-invited to overridden instance.


git-svn-id: https://svn.calendarserver.org/repository/calendarserver@13956 e27351fd-9f3e-4f54-a53b-843176b1656c