Give warning with donor pool so as to explain why there may be a slow startup.

main.c

@@ -3954,8 +3954,12 @@ static bool pool_active(struct pool *pool, bool pinging)
 	} else {
 		applog(LOG_DEBUG, "FAILED to retrieve work from pool %u %s",
 		       pool->pool_no, pool->rpc_url);
-		if (!pinging && pool != &donationpool)
+		if (!pinging) {
+			if (!donor(pool))
 				applog(LOG_WARNING, "Pool %u slow/down or URL or credentials invalid", pool->pool_no);
+			else
+				applog(LOG_WARNING, "Donor pool slow to respond");
+		}
 	}
 
 	curl_easy_cleanup(curl);