import-trace: extend sanity checks to time1/2

Up to now, the sanity checks only tested equivalence classes
determined by dynamic instructions (instr1/instr2), although the
actual timing boundaries (time1/time2) have been the really relevant
information for quite some time now.  This change extends the checks
to time1/time2.

Change-Id: I53d1ed10684ff09f6b9f1245ef842dd0d85f2655