Make sure the current etag is always used ahead of any schedule-etags in a pre-condition check.
Make sure the current etag is always used ahead of any schedule-etags in a pre-condition check.

git-svn-id: 0c33e958600270102f91bf5868e396345dde476c@7270 e27351fd-9f3e-4f54-a53b-843176b1656c

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