nftables: add ptest

Note that (like for nftables itself), the ptests will require the
following added to local.conf (or the kernel configuration):

KERNEL_FEATURES:append = " features/nf_tables/nf_tables.scc"

Current pass/fail results:

I: results: [OK] 271 [FAILED] 29 [TOTAL] 300

I've been investigating the failing tests under the assumption that they
fail because of missing kernel modules, but there are some that suggest
syntax problems (possibly problems with the tests themselves). Example:

W: [FAILED]     ./tests/shell/testcases/listing/0020flowtable_0: got 1
/dev/stdin:2:12-12: Error: Could not process rule: No such file or
directory
        flowtable f {
                  ^
/dev/stdin:6:11-12: Error: Could not process rule: No such file or
directory
flowtable f2 {
          ^^

Signed-off-by: Trevor Gamblin <trevor.gamblin@windriver.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

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