change while loop conditions to fix infinite loop

[nick-mccoy]

The while loop for in_app_events had:

while to_datetime <= stop_datetime

which caused an infinite loop since, once the stream caught up, to_datetime was equal to stop_datetime. Since there is a limit on the requested reports, once the tap would loop until it hit that limit and then receive a 400 and error out.

This changes the loop to

while from_datetime < to_datetime