Clients connected and bytes used is too spammy for verbose.

This message is there for ten years, but is hardly useful.
Moreover it is likely that it will fill an entire disk if log ratation
is not configured, for no good reasons.

src/server.c

@@ -1942,7 +1942,7 @@ int serverCron(struct aeEventLoop *eventLoop, long long id, void *clientData) {
     /* Show information about connected clients */
     if (!server.sentinel_mode) {
         run_with_period(5000) {
-            serverLog(LL_VERBOSE,
+            serverLog(LL_DEBUG,
                 "%lu clients connected (%lu replicas), %zu bytes in use",
                 listLength(server.clients)-listLength(server.slaves),
                 listLength(server.slaves),