[LTP] [PATCH v5 ltp] Add 4 more cases for Intel PT.

[Petr Vorel]

Hi Ammy,

> 1. Add Intel PT sanpshot mode test.
> 2. Add Intel PT exclude user trace mode test.
> 3. Add Intel PT exclude kernel trace mode test.
> 4. Add Intel PT disable branch trace mode test.

> Signed-off-by: Ammy Yi <ammy.yi@intel.com>

Merged with tiny formatting changes.
Thanks for your patch!

Kind regards,
Petr