python/network/pcap_netmap: recognize LLTD and HomePlug
python/network/pcap_netmap: recognize LLTD and HomePlug

These link-layer protocols are quite noisy in some local networks.

While at it, rename some properties in Ethernet decoding in order to be
able to add more new protocols easily.

fishilico/shared,fishilico/shared,fishilico/shared,fishilico/shared,fishilico/shared,fishilico/shared,fishilico/shared