Check if there is not virtualenv and create it in init_build, cuz we need it.
Check if there is not virtualenv and create it in init_build, cuz we need it.


git-svn-id: 0c33e958600270102f91bf5868e396345dde476c@12617 e27351fd-9f3e-4f54-a53b-843176b1656c

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