added memif interface test to tests/integration (#1412)
added memif interface test to tests/integration (#1412)

Signed-off-by: Stanislav Chlebec <c0cbfd1f0d33178bb911156d16e6e62b9136364d@pantheon.tech>
ondrej-fabry/vpp-agent,VladoLavor/vpp-agent,ondrej-fabry/vpp-agent,VladoLavor/vpp-agent,VladoLavor/vpp-agent,ondrej-fabry/vpp-agent