box-switch_mode: fix the memory leak on reload configuration

Fix the memory leak which would occur when
allocating memory for the "status" string,
output by 'show info'. The allocation was done
on each RELOAD CONFIGURATION, and
old memory was never freed.

Fix: use static memory instead of palloc.

mod/box/box.m

@@ -53,7 +53,7 @@ static void box_process_rw(u32 op, struct tbuf *request_data);
 const char *mod_name = "Box";
 
 iproto_callback rw_callback = box_process_ro;
-static char *status = "unknown";
+static char status[64] = "unknown";
 
 static int stat_base;
 STRS(messages, MESSAGES);
@@ -1239,8 +1239,7 @@ remote_recovery_restart(struct tarantool_cfg *conf)
 					       conf->wal_feeder_port,
 					       default_remote_row_handler);
 
-	status = palloc(eter_pool, 64);
-	snprintf(status, 64, "replica/%s:%i%s", conf->wal_feeder_ipaddr,
+	snprintf(status, sizeof(status), "replica/%s:%i%s", conf->wal_feeder_ipaddr,
 		 conf->wal_feeder_port, custom_proc_title);
 	title("replica/%s:%i%s", conf->wal_feeder_ipaddr, conf->wal_feeder_port,
 	      custom_proc_title);
@@ -1264,10 +1263,10 @@ box_master_or_slave(struct tarantool_cfg *conf)
 		}
 		rw_callback = box_process_rw;
 
-		say_info("I am primary");
-
-		status = "primary";
+		snprintf(status, sizeof(status), "primary");
 		title("primary");
+
+		say_info("I am primary");
 	}
 }
 
@@ -1422,7 +1421,7 @@ mod_init(void)
 	if (cfg.local_hot_standby) {
 		say_info("starting local hot standby");
 		recover_follow(recovery_state, cfg.wal_dir_rescan_delay);
-		status = "hot_standby";
+		snprintf(status, sizeof(status), "hot_standby");
 		title("hot_standby");
 	}
 
@@ -1440,8 +1439,6 @@ mod_init(void)
 				     (fiber_server_callback) iproto_interact,
 				     &rw_callback, box_bound_to_primary);
 	}
-
-	say_info("initialized");
 }
 
 int