fix dhcp requests and replies operation headers

Signed-off-by: Vasiliy Tolstov <v.tolstov@selfip.ru>
add icmpv6 package

Signed-off-by: Vasiliy Tolstov <v.tolstov@selfip.ru>
split icmp to 4 and 6, rename ipv4 files

Signed-off-by: Vasiliy Tolstov <v.tolstov@selfip.ru>
add ipv6 package

Signed-off-by: Vasiliy Tolstov <v.tolstov@selfip.ru>
add ipv6 package

Signed-off-by: Vasiliy Tolstov <v.tolstov@selfip.ru>
fix icmp unmarshal error

Signed-off-by: Vasiliy Tolstov <v.tolstov@selfip.ru>