acl: fix stats-segment counters validation on acl update
The stats-segment validation/clear logic for acl counters was wrong,
fix it. Also add the code to the unittests to cover that case,
add a vat command to enable/disable counters, clean up
the unnecessary endian conversion and remove the stray clib_warning()
Change-Id: I421297a92e4aeb885c468c72a97cec25981df615
Type: fix
Ticket: VPP-1744
Fixes:
f995c7122ba0d024b17bc3232e8edd18d5e25088
Signed-off-by: Andrew Yourtchenko <ayourtch@gmail.com>
(cherry picked from commit
4c945dacb9ff9da731301feb26b1edb4ac00e8bd)