The help string of set vxlan*, set nvgre* are in "config" section.
But they actually do not alter NIC or testpmd's configuration and
they will be used by "flow" command later.
Put them in "filters" section along with "flow" command seems more
reasonable.
Signed-off-by: Xiaoyu Min <jackmin@mellanox.com>
Reviewed-by: Ferruh Yigit <ferruh.yigit@intel.com>