Bug#43983 Support force restart of all servers after test ended

- Some tests need to modify the server(s) so much that a total restart of all servers are
   necessary after test. Make it possible for a test to signal it want mtr.pl to restart
   all servers.

mysql-test/include/mtr_check.sql

@@ -57,3 +57,13 @@ BEGIN
     mysql.user;
 
 END||
+
+--
+-- Procedure used by test case used to force all
+-- servers to restart after testcase and thus skipping
+-- check test case after test
+--
+CREATE DEFINER=root@localhost PROCEDURE force_restart()
+BEGIN
+  SELECT 1 INTO OUTFILE 'force_restart';
+END||

mysql-test/mysql-test-run.pl

@@ -3067,6 +3067,26 @@ sub find_analyze_request
 }
 
 
+# The test can leave a file in var/tmp/ to signal
+# that all servers should be restarted
+sub restart_forced_by_test
+{
+  my $restart = 0;
+  foreach my $mysqld ( mysqlds() )
+  {
+    my $datadir = $mysqld->value('datadir');
+    my $force_restart_file = "$datadir/mtr/force_restart";
+    if ( -f $force_restart_file )
+    {
+      mtr_verbose("Restart of servers forced by test");
+      $restart = 1;
+      last;
+    }
+  }
+  return $restart;
+}
+
+
 # Return timezone value of tinfo or default value
 sub timezone {
   my ($tinfo)= @_;
@@ -3235,7 +3255,11 @@ sub run_testcase ($) {
       if ( $res == 0 )
       {
 	my $check_res;
-	if ( $opt_check_testcases and
+	if ( restart_forced_by_test() )
+	{
+	  stop_all_servers();
+	}
+	elsif ( $opt_check_testcases and
 	     $check_res= check_testcase($tinfo, "after"))
 	{
 	  if ($check_res == 1) {