MDEV-27575 Add sleeping statement spider/bugfix.mdev_27575

This could help prevent race condition when shutting down the server
not long after loading spider. Thus only needed for 10.4-10.6.

storage/spider/mysql-test/spider/bugfix/r/mdev_27575.result

@@ -5,8 +5,14 @@ for master_1
 for child2
 for child3
 SET GLOBAL default_tmp_storage_engine=spider;
+SELECT SLEEP(1);
+SLEEP(1)
+0
 # restart
 SET GLOBAL default_storage_engine=Spider;
+SELECT SLEEP(1);
+SLEEP(1)
+0
 # restart
 for master_1
 for child2

storage/spider/mysql-test/spider/bugfix/t/mdev_27575.test

@@ -8,9 +8,11 @@
 --enable_query_log
 
 SET GLOBAL default_tmp_storage_engine=spider;
+SELECT SLEEP(1);
 --source include/restart_mysqld.inc
 
 SET GLOBAL default_storage_engine=Spider;
+SELECT SLEEP(1);
 --source include/restart_mysqld.inc
 
 --disable_query_log