Disable merged packets

When installing Ella Core in tcx or xdp-generic datapath mode, no merged packets should reach the data plane (see the merged packets explanation for more info). Apply this to both the N3 and the N6 interface. Depending on the deployment:

Physical NIC:

ethtool -K <interface> gro off lro off

veth:

ethtool -K <peer> tso off gso off

virtio (VM):

ethtool -K <interface> gro off rx-gro-hw off