Fix name of ipv6-n-tuple
#define foreach_flow_type \
_(IP4_N_TUPLE, ip4_n_tuple, "ipv4-n-tuple") \
- _(IP6_N_TUPLE, ip6_n_tuple, "ipv4-n-tuple") \
+ _(IP6_N_TUPLE, ip6_n_tuple, "ipv6-n-tuple") \
_(IP4_VXLAN, ip4_vxlan, "ipv4-vxlan") \
_(IP6_VXLAN, ip6_vxlan, "ipv6-vxlan")
