pkt-gen: ignore the -E option
pkt-gen: ignore the -E option

The option had never done what the help message
said. Moreover, what it actually did (i.e., specify
the size of the pipe lookup table in the parent) is now
done automatically, so we can ignore it.

luigirizzo/netmap,luigirizzo/netmap,luigirizzo/netmap,luigirizzo/netmap,luigirizzo/netmap