tests: net: conn_mgr: Use valid LL address in tests

Using L2 address of length 1 (invalid/unsupported one) confused IPv6
layer during LL address generation - since that length was not a valid
one, the address was not initialized properly and a part of it was set
semi-random. This could result for example in filling out the neighbor
tables.

Signed-off-by: Robert Lubos <[email protected]>
(cherry picked from commit 3089a5d)

Author: rlubos

tests/net/conn_mgr_conn/src/test_ifaces.c

@@ -16,7 +16,7 @@
 static void test_iface_init(struct net_if *iface)
 {
 	/* Fake link layer address is needed to silence assertions inside the net core */
-	static uint8_t fake_lladdr[] = { 0x01 };
+	static uint8_t fake_lladdr[] = { 0x00, 0x00, 0x5E, 0x00, 0x53, 0x01 };
 
 	net_if_set_link_addr(iface, fake_lladdr, sizeof(fake_lladdr), NET_LINK_DUMMY);
 

tests/net/conn_mgr_monitor/src/test_ifaces.c

@@ -15,7 +15,7 @@
 static void test_iface_init(struct net_if *iface)
 {
 	/* Fake link layer address is needed to silence assertions inside the net core */
-	static uint8_t fake_lladdr[] = { 0x01 };
+	static uint8_t fake_lladdr[] = { 0x00, 0x00, 0x5E, 0x00, 0x53, 0x01 };
 
 	net_if_set_link_addr(iface, fake_lladdr, sizeof(fake_lladdr), NET_LINK_DUMMY);