Add default RTE_TARGET to libvport Makefile

Without this patch, it would require appending RTE_TARGET to make command to build.
All other Makefiles under openvswitch/datapath sets a default RTE_TARGET.

Signed-off-by: Shu Shen <shu.shen@radisys.com>
lib/dpif-dpdk: fix memory leak in dpif_dpdk_recv()

After using ofpbuf in stack, there is no ofpbuf_uninit() to release
memory. This causes memory leak.

Signed-off-by: Hiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>
Reviewed-by: Hayato Momma <h-momma@ce.jp.nec.com>