tests/gnrc_netif: disable NDP emissions

This test doesn't test NDP behavior so emissions of NDP neighbor and
router solicitations is more harming than helpful. Because of that I
disabled it for this test.

tests/gnrc_netif/Makefile

@@ -21,6 +21,10 @@ USEMODULE += netdev_ieee802154
 USEMODULE += netdev_test
 USEMODULE += od
 
+# deactivate automatically emitted packets from IPv6 neighbor discovery
+CFLAGS += -DGNRC_IPV6_NIB_CONF_ARSM=0
+CFLAGS += -DGNRC_IPV6_NIB_CONF_SLAAC=0
+CFLAGS += -DGNRC_IPV6_NIB_CONF_NO_RTR_SOL=1
 CFLAGS += -DGNRC_NETIF_NUMOF=4
 CFLAGS += -DGNRC_NETIF_ADDRS_NUMOF=16
 CFLAGS += -DGNRC_NETIF_GROUPS_NUMOF=8