wait-online: by default not all interface need to be online

Fixes an issue caused by ab3aed4 (v253).

By default, all managed interface need to be configured, and at least
one interface need to be online. Hence, offline interface should be ignored.

Fixes #29506.

src/network/wait-online/manager.c

@@ -174,7 +174,9 @@ bool manager_configured(Manager *m) {
                 }
 
                 r = manager_link_is_online(m, l, /* state_range = */ NULL);
-                if (r < 0 && !m->any) /* Unlike the above loop, unmanaged interfaces are ignored here. */
+                /* Unlike the above loop, unmanaged interfaces are ignored here. Also, Configured but offline
+                 * interfaces are ignored. See issue #29506. */
+                if (r < 0 && r != -EADDRNOTAVAIL && !m->any)
                         return false;
                 if (r > 0) {
                         if (m->any)