Avoid intermittent error.


git-svn-id: https://svn.calendarserver.org/repository/calendarserver@14074 e27351fd-9f3e-4f54-a53b-843176b1656c
Tweak test work queue delays to try to avoid intermittent CDT failures.


git-svn-id: https://svn.calendarserver.org/repository/calendarserver@14075 e27351fd-9f3e-4f54-a53b-843176b1656c
Change augments conversion to only write out new file if there were changes. Also use the xmlutil apis so that proper XML file header is used.


git-svn-id: https://svn.calendarserver.org/repository/calendarserver@14076 e27351fd-9f3e-4f54-a53b-843176b1656c