Integrate nc in secator/tasks/nc.py.

it should be used like secator x nc -p and it should output a Tag category "info" and name "tcp_banner" and the value would be the banner found in the nc output.

Make sure to add the UDP option with -u and if set set the Tag name to "udp_banner" instead.

Add a fixture to tests/fixtures/nc_output.txt.

Add an input to tests/integration/inputs.py.