network: enter initialized state when the interface will be reconfigured

When the interface is in the failed state, link_getlink_handler_internal()
will do nothing and return zero, thus the interface will not be
reconfigured, especially when the reconfiguration is triggered in
link_enter_failed().

Follow-up for c2eb7753dd.

src/network/networkd-link-bus.c

@@ -669,7 +669,6 @@ int bus_link_method_reconfigure(sd_bus_message *message, void *userdata, sd_bus_
         if (r < 0)
                 return r;
         if (r > 0) {
-                link_set_state(l, LINK_STATE_INITIALIZED);
                 r = link_save_and_clean_full(l, /* also_save_manager = */ true);
                 if (r < 0)
                         return r;

src/network/networkd-link.c

@@ -1454,6 +1454,9 @@ int link_reconfigure(Link *link, bool force) {
         if (r < 0)
                 return r;
 
+        if (force || link->state == LINK_STATE_FAILED)
+                link_set_state(link, LINK_STATE_INITIALIZED);
+
         return 1; /* 1 means the interface will be reconfigured. */
 }
 
@@ -1536,6 +1539,9 @@ int link_reconfigure_on_bus_method_reload(Link *link, sd_bus_message *message) {
         TAKE_PTR(data);
         link->manager->reloading++;
 
+        if (link->state == LINK_STATE_FAILED)
+                link_set_state(link, LINK_STATE_INITIALIZED);
+
         return 0;
 }