increase granularity of time to be < 1 day.

we were only sorting the list based on the integer day when things
were happening, which just caused confusion. Make this a more strict
time sort.

Change-Id: Iccd228069707368c7da8d060486567d4b389e9b1
Reviewed-on: https://review.openstack.org/23587
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Approved: James E. Blair <corvus@inaugust.com>
Reviewed-by: James E. Blair <corvus@inaugust.com>
Tested-by: Jenkins