[nfv.config] Add real-scale integration tests for `snabbnfv-traffic'
based on `bench_env'.
[lib.nfv] selftest.sh: Added rudimentary filter test.
[lib.nfv] selftest.sh: Disable test cases known to fail.
Merge pull request #280 from eugeneia/lib_nfv-selftest

[nfv.config] Add real-scale integration tests for `snabbnfv-traffic'