tp: improve diff testing script when tp returns error retcode am: b6fd42ad9a am: f299100f98
tp: improve diff testing script when tp returns error retcode am: b6fd42ad9a am: f299100f98

Change-Id: I72acceeffdb781b3bf544f31aeea5ca2b3fcca0f

google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto