tmf: Handle state changes ending after the trace ends

tmf: Handle state changes ending after the trace ends

Since it's possible to add states ending in the future, we
have to handle the case where a state would end past the
trace's end time (and the history's end time). We simply
discard it in this case.

Change-Id: Ic0c525aece776cb4e742d8829e420d50570b36a0
Signed-off-by: Alexandre Montplaisir <alexmonthy@voxpopuli.im>
Reviewed-on: https://git.eclipse.org/r/7077
Reviewed-by: Matthew Khouzam <matthew.khouzam@ericsson.com>
IP-Clean: Matthew Khouzam <matthew.khouzam@ericsson.com>
Tested-by: Matthew Khouzam <matthew.khouzam@ericsson.com>