[LTP] Add new test for pipe2 with/without O_NONBLOCK mode

[Li Wang]

Hi Xu, Laniel,

Patchset changed as the following and pushed:

  * [1/2] move safe_pipe2() to tst_safe_macro.c
  * [1/2] remove cleanup_fn callback from function
  * [1/2] replace tst_brk() by tst_brk_()
  * [1/2] add flag in the print message
  * [2/2] rename to pipe2_04.c
  * [2/2] remove useless status variable
  * [2/2] code indent cleanup

@Laniel, remember to use '-s' in the git-commit command next time, then it
will help add the Signed-off-by: automatically.

-- 
Regards,
Li Wang
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