Fix broken schedule tracking IT test

https://trello.com/c/MlOQMbLm

Test failure was caused by hard wired dates and the maximum duration of the schedule having elapsed, which causes the enrollment to start out "DEFAULTED" and an exception is thrown when attempting to fulfill a milestone on a non-active enrollment

Change-Id: I2bc12856bdbf7105693792aeae671528b6208327