Fix a segment fault error for DPDK 17.02

I found a segment fault error when I use DPDK 17.02 branch, here is
segment fault information:

Program terminated with signal SIGSEGV, Segmentation fault.
702 __builtin_ia32_storedqu ((char *)__P, (__v16qi)__B);
(gdb) bt
    at build/production/vrouter/dpdk/x86_64-native-linuxapp-gcc/include/rte_memcpy.h:820
    at build/production/vrouter/dpdk/x86_64-native-linuxapp-gcc/include/rte_memcpy.h:896
    at vrouter/dpdk/vr_dpdk_host.c:793
    at vrouter/dp-core/vr_proto_ip.c:373
(gdb)

We encountered it in DPDK 17.11 branch, the issue is rte_mbuf can't be freed
if it is copied or cloned from another rtm_mbuf with IND_ATTACHED_MBUF flag,
it will result in very weird issues.

Change-Id: Iae6d229488225a97ef2f96c52db1dbcaaa32b51a
Closes-Bug: #1774903
Signed-off-by: Yi Yang <yi.y.yang@intel.com>
(cherry picked from commit e866729)

dpdk/vr_dpdk_host.c

@@ -246,7 +246,7 @@ dpdk_pktmbuf_data_copy(struct rte_mbuf *dst, struct rte_mbuf *src)
     dst->data_off = src->data_off;
     dst->port = src->port;
     dst->ol_flags = src->ol_flags;
-#if (RTE_VERSION >= RTE_VERSION_NUM(17, 11, 0, 0))
+#ifdef IND_ATTACHED_MBUF
     dst->ol_flags &= (~IND_ATTACHED_MBUF);
 #endif
     dst->packet_type = src->packet_type;