test: use existing timestamp in test_parse_special_field
test: use existing timestamp in test_parse_special_field

Calculating our the timestamp for the index of events is not needed.  Tell
trappy to not normalize the time and that way we don't need to do the
error-prone calculation ourselves.

ARM-software/trappy,bjackman/trappy,sinkap/trappy,JaviMerino/trappy,joelagnel/trappy,bjackman/trappy,JaviMerino/trappy,ARM-software/trappy,sinkap/trappy,ARM-software/trappy,ARM-software/trappy,joelagnel/trappy,joelagnel/trappy,sinkap/trappy,joelagnel/trappy,sinkap/trappy,JaviMerino/trappy,bjackman/trappy,bjackman/trappy