tree-wide: install matches asynchronously

Let's remove a number of synchronization points from our service
startups: let's drop synchronous match installation, and let's opt for
asynchronous instead.

Also, let's use sd_bus_match_signal() instead of sd_bus_add_match()
where we can.

src/libsystemd/sd-bus/bus-track.c

@@ -259,9 +259,7 @@ _public_ int sd_bus_track_add_name(sd_bus_track *track, const char *name) {
 
         bus_track_remove_from_queue(track); /* don't dispatch this while we work in it */
 
-        track->n_adding++; /* make sure we aren't dispatched while we synchronously add this match */
-        r = sd_bus_add_match(track->bus, &n->slot, match, on_name_owner_changed, track);
-        track->n_adding--;
+        r = sd_bus_add_match_async(track->bus, &n->slot, match, on_name_owner_changed, NULL, track);
         if (r < 0) {
                 bus_track_add_to_queue(track);
                 return r;

src/libsystemd/sd-bus/test-bus-chat.c

@@ -102,9 +102,9 @@ static int server_init(sd_bus **_bus) {
                 goto fail;
         }
 
-        r = sd_bus_add_match(bus, NULL, "type='signal',interface='foo.bar',member='Notify'", match_callback, NULL);
+        r = sd_bus_match_signal(bus, NULL, NULL, NULL, "foo.bar", "Notify", match_callback, NULL);
         if (r < 0) {
-                log_error_errno(r, "Failed to add match: %m");
+                log_error_errno(r, "Failed to request match: %m");
                 goto fail;
         }