Backport from 5.0 a fix that will start ndb only for tests that needs it

mysql-test/lib/mtr_cases.pl:
  Detect which tests that need ndb
mysql-test/lib/mtr_match.pl:
  Add function mtr_match_substring
mysql-test/mysql-test-run.pl:
  Only start cluster for test cases that need it

mysql-test/lib/mtr_cases.pl

@@ -193,6 +193,28 @@ sub collect_one_test_case($$$$$$) {
     $tinfo->{'slave_restart'}= 1;
   }
 
+  # Cluster is needed by test case if testname contains ndb
+  if ( defined mtr_match_substring($tname,"ndb") )
+  {
+    $tinfo->{'ndb_test'}= 1;
+    if ( $::opt_skip_ndbcluster )
+    {
+      # Skip all ndb tests
+      $tinfo->{'skip'}= 1;
+      return;
+    }
+    if ( ! $::opt_with_ndbcluster )
+    {
+      # Ndb is not supported, skip them
+      $tinfo->{'skip'}= 1;
+      return;
+    }
+  }
+  else
+  {
+    $tinfo->{'ndb_test'}= 0;
+  }
+
   # FIXME what about embedded_server + ndbcluster, skip ?!
 
   my $master_opt_file= "$testdir/$tname-master.opt";

mysql-test/lib/mtr_match.pl

@@ -50,6 +50,23 @@ sub mtr_match_extension ($$) {
 }
 
 
+# Match a substring anywere in a string
+
+sub mtr_match_substring ($$) {
+  my $string= shift;
+  my $substring= shift;
+
+  if ( $string =~ /(.*)\Q$substring\E(.*)$/ ) # strncmp
+  {
+    return $1;
+  }
+  else
+  {
+    return undef;		# NULL
+  }
+}
+
+
 sub mtr_match_any_exact ($$) {
   my $string= shift;
   my $mlist=  shift;

mysql-test/mysql-test-run.pl

@@ -1581,6 +1581,16 @@ sub run_testcase ($) {
     {
       $do_restart= 1;           # Always restart if script to run
     }
+    elsif ( $tinfo->{'ndb_test'} and $master->[0]->{'ndbcluster'} == 1 )
+    {
+      $do_restart= 1;           # Restart with cluster
+      # print "Restarting because cluster need to be enabled\n";
+    }
+    elsif ($tinfo->{'ndb_test'} == 0 and $master->[0]->{'ndbcluster'} == 0)
+    {
+      $do_restart= 1;           # Restart without cluster
+      # print "Restarting because cluster need to be disabled\n";
+    }
     elsif ( $master->[0]->{'running_master_is_special'} and
             $master->[0]->{'running_master_is_special'}->{'timezone'} eq
             $tinfo->{'timezone'} and
@@ -1646,7 +1656,7 @@ sub run_testcase ($) {
 
     if ( ! $opt_local_master )
     {
-      if ( $master->[0]->{'ndbcluster'} )
+      if ( $master->[0]->{'ndbcluster'} && $tinfo->{'ndb_test'})
       {
 	$master->[0]->{'ndbcluster'}= ndbcluster_start();
         if ( $master->[0]->{'ndbcluster'} )
@@ -1659,8 +1669,22 @@ sub run_testcase ($) {
       {
         # FIXME not correct location for do_before_start_master()
         do_before_start_master($tname,$tinfo->{'master_sh'});
+
+	# Save skip_ndbcluster
+	my $save_opt_skip_ndbcluster= $opt_skip_ndbcluster;
+	if (!$tinfo->{'ndb_test'})
+	{
+	  # Modify skip_ndbcluster so cluster is skipped for this
+          # and subsequent testcases(until we find one that does not cluster)
+	  $opt_skip_ndbcluster= 1;
+	}
+
         $master->[0]->{'pid'}=
           mysqld_start('master',0,$tinfo->{'master_opt'},[]);
+
+	# Restore skip_ndbcluster
+	$opt_skip_ndbcluster= $save_opt_skip_ndbcluster;
+
         if ( ! $master->[0]->{'pid'} )
         {
           report_failure_and_restart($tinfo);
@@ -2026,7 +2050,7 @@ sub mysqld_arguments ($$$$$) {
     }
   }
 
-  if ( $opt_with_ndbcluster )
+  if ( $opt_with_ndbcluster && !$opt_skip_ndbcluster)
   {
     mtr_add_arg($args, "%s--ndbcluster", $prefix);
     mtr_add_arg($args, "%s--ndb-connectstring=%s", $prefix,