repmgrd: restrict BDR monitoring to two node setup

It's not safe to have more than two nodes with this kind of
"failover", so we don't need to select alternative nodes by
priority.

repmgrd-physical.c

@@ -325,7 +325,11 @@ monitor_streaming_primary(void)
 				INSTR_TIME_SET_CURRENT(log_status_interval_start);
 			}
 		}
-		sleep(1);
+
+		log_verbose(LOG_DEBUG, "sleeping %i seconds (\"monitor_interval_secs\")",
+					config_file_options.monitor_interval_secs);
+
+		sleep(config_file_options.monitor_interval_secs);
 	}
 }