libnetutil: Check dhcp respose packet length am: 61f25d4a36 am: cee6d38c55 am: 29d054046f am: c29049f4f8 am: 3de04e9840 am: 19702dc499 am: 8191e9ba87 am: 804323c195 am: 4f5f00d879 am: 3a1ff1ad71 am: bab7b1ecd9 am: cdf0fc6018
am: 9f1398c6e3

Change-Id: I4c46a36846dd8f6588f29bc84de9bc3f1d7c088a