com.docker.slirp: UDP NAT: drop big corrupted packets
com.docker.slirp: UDP NAT: drop big corrupted packets

If we receive a packet whose reported length won't fit in the supplied
payload, log a message and drop the packet rather than raise an exception.

Signed-off-by: David Scott <63c9eb0ea83039690fefa11afe17873ba8278a56@docker.com>

djs55/vpnkit,djs55/vpnkit,samoht/vpnkit,djs55/vpnkit