[LTP] [PATCH v3] lib: tst_test: Add reproducible output.

[Petr Vorel]

Hi Cyril,

+	fprintf(stderr, "LTP_REPRODUCIBLE_OUTPUT When set to 1 or y discards the actual content of the messages printed by the test\n");

nit: "When set to 1 or y" is slightly verbose to me.  Maybe just "1/y discards
the actual content of the messages printed by the test" ?

But anyway that's very minor, therefore I kept the same approach when adding
LTP_ENABLE_DEBUG in the next patch I'm going to send now.

Kind regards,
Petr