job_specs: 2n-tx2 reduce number of report coverage tests

job_specs: 2n-tx2 reduce number of report coverage tests

Remove:
- All vts tests, obsolete use cases.
- dot1q tests apart from dot1q-l2bd, superfluous combinations.
- nat44 -pps tests, replaced by -tput tests.
- nat44 h1-p1-s1 single session tests, unessential combination.
- nat44 h4096-p63-s258048 tests, non-essential scale combination.

Change-Id: Ia2187fa0ba9c8836840aa2fb7d0c335a3b0d91b1
Signed-off-by: Maciek Konstantynowicz <mkonstan@cisco.com>