mbuf: copy offload flags when doing attach/clone
mbuf: copy offload flags when doing attach/clone

rte_pktmbuf_attach copies the packet meta data but does not
copy the offload flags. This means that cloned packets lose
their offload settings such as vlan tag.

Signed-off-by: Stephen Hemminger <5939443bd6498ae9d7581c946dfbecf8ed1feac0@brocade.com>
Acked-by: Thomas Monjalon <ee2fa8b2681c737f775687e475dcbf2028a412f1@6wind.com>

tsphillips/dpdk-fork,mixja/dpdk,msune/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,msune/dpdk,msune/dpdk,mixja/dpdk,mixja/dpdk,tsphillips/dpdk-fork,msune/dpdk,venkynv/dpdk-mirror,john-mcnamara-intel/dpdk,venkynv/dpdk-mirror,tsphillips/dpdk-fork,mixja/dpdk,tsphillips/dpdk-fork,venkynv/dpdk-mirror,venkynv/dpdk-mirror,john-mcnamara-intel/dpdk