Adds dashboard support for directory service stats


git-svn-id: https://svn.calendarserver.org/repository/calendarserver@13609 e27351fd-9f3e-4f54-a53b-843176b1656c
Limit OD queries to the record types we're configured for


git-svn-id: https://svn.calendarserver.org/repository/calendarserver@13610 e27351fd-9f3e-4f54-a53b-843176b1656c
Break recordsMatchingTokens queries up by recordType because twext.who.opendirectory can't cope


git-svn-id: https://svn.calendarserver.org/repository/calendarserver@13611 e27351fd-9f3e-4f54-a53b-843176b1656c