BUG#27807237: MTR --MANUAL-BOOT-GDB FAILS ON MYSQL-5.7 BUILDS

Description:
------------
MTR --manual-boot-gdb fails on mysql-5.7 builds.

Issue:
------
When --manual-boot-gdb option is enabled, mysql and test directories
are not created, causing the 'mysqld --bootstap' command to fail.

Fix:
----
Create the directories for mysql and test database under datadir
location before invoking gdb for mysqld bootstrap.

Change-Id: I14a8560a3c16fde2f10910375a7e3bbef3d6bc0e

mysql-test/mysql-test-run.pl

@@ -4040,6 +4040,10 @@ sub mysql_install_db {
   mtr_tofile($bootstrap_sql_file,
              sql_to_bootstrap(mtr_grab_file("include/mtr_check.sql")));
 
+  # Create directories mysql and test
+  mkpath("$install_datadir/mysql");
+  mkpath("$install_datadir/test");
+
   if ( $opt_manual_boot_gdb )
   {
     # The configuration has been set up and user has been prompted for
@@ -4055,10 +4059,6 @@ sub mysql_install_db {
   mtr_tofile($path_bootstrap_log,
 	     "$exe_mysqld_bootstrap " . join(" ", @$args) . "\n");
 
-  # Create directories mysql and test
-  mkpath("$install_datadir/mysql");
-  mkpath("$install_datadir/test");
-
   if ( My::SafeProcess->run
        (
 	name          => "bootstrap",