Fix shutdown delay option name according to The Manual.

mysql-test/mysql-test-run.pl

@@ -2993,7 +2993,7 @@ language            = $path_language
 character-sets-dir  = $path_charsetsdir
 basedir             = $path_my_basedir
 server_id           = $server_id
-shutdown_delay      = 10
+shutdown-delay      = 10
 skip-stack-trace
 skip-innodb
 skip-ndbcluster

server-tools/instance-manager/instance_options.cc

@@ -510,7 +510,7 @@ int Instance_options::add_option(const char* option)
     {"--pid-file=", 11, &mysqld_pid_file, SAVE_WHOLE_AND_ADD},
     {"--mysqld-path=", 14, &mysqld_path, SAVE_VALUE},
     {"--nonguarded", 9, &nonguarded, SAVE_WHOLE},
-    {"--shutdown_delay", 9, &shutdown_delay, SAVE_VALUE},
+    {"--shutdown-delay", 9, &shutdown_delay, SAVE_VALUE},
     {NULL, 0, NULL, 0}
   };
   struct selected_options_st *selected_options;