clusterer: Log all major sync stages at INFO level

Motivation: these logs are not spammy at all, yet very useful/reassuring
to see in production after issuing data sync commands.

(cherry picked from commit 8e391c2)

modules/clusterer/sync.c

@@ -46,8 +46,9 @@ int send_sync_req(str *capability, int cluster_id, int source_id)
 
 	rc = clusterer_send_msg(&packet, cluster_id, source_id);
 	if (rc == CLUSTERER_SEND_SUCCES)
-		LM_DBG("Sync request sent for capability: %.*s to node: %d\n",
-			capability->len, capability->s, source_id);
+		LM_INFO("Sent sync request for capability '%.*s' to node %d, "
+		        "cluster %d\n", capability->len, capability->s, source_id,
+		        cluster_id);
 
 	bin_free_packet(&packet);
 
@@ -324,8 +325,8 @@ int send_sync_repl(cluster_info_t *cluster, int node_id, str *cap_name)
 
 	bin_free_packet(&sync_end_pkt);
 
-	LM_DBG("Sent all sync packets for capability: %.*s to node: %d\n",
-		cap_name->len, cap_name->s, node_id);
+	LM_INFO("Sent all sync packets for capability '%.*s' to node %d, cluster "
+	        "%d\n", cap_name->len, cap_name->s, node_id, cluster->cluster_id);
 
 	return 0;
 }
@@ -339,8 +340,9 @@ void handle_sync_request(bin_packet_t *packet, cluster_info_t *cluster,
 
 	bin_pop_str(packet, &cap_name);
 
-	LM_DBG("Received sync request for capability: %.*s from: %d\n", cap_name.len,
-		cap_name.s, source->node_id);
+	LM_INFO("Received sync request for capability '%.*s' from node %d, "
+	        "cluster %d\n", cap_name.len, cap_name.s, source->node_id,
+	        cluster->cluster_id);
 
 	nhop = get_next_hop(source);
 	if (nhop > 0) {
@@ -405,8 +407,8 @@ void handle_sync_packet(bin_packet_t *packet, int packet_type,
 		next_data_chunk = NULL;
 		cap->reg.packet_cb(packet);
 	} else { /* CLUSTERER_SYNC_END */
-		LM_DBG("Received all sync packets for capability: %.*s\n", cap_name.len,
-			cap_name.s);
+		LM_INFO("Received all sync packets for capability '%.*s' in "
+		        "cluster %d\n", cap_name.len, cap_name.s, cluster->cluster_id);
 
 		lock_get(cluster->lock);