Fix problem with mysqladmin logging to var/log before var has been created

And if var/ has been created, it will be recreated later so the logs
from "mtr_kill_leftovers" will be lost anyway  


mysql-test/mysql-test-run.pl:
  Don't create vardir before mtr_kill_leftovers
mysql-test/lib/mtr_process.pl:
  Send output - if any - from mysqladmin to stdout/stderr. There shouldn't
  be any such errors and if any occur, it's good to know about them.

mysql-test/lib/mtr_process.pl

@@ -708,7 +708,7 @@ sub mtr_wait_blocking($) {
   }
 }
 
-# Start "mysqladmin shutdown" for a specific mysqld
+# Start "mysqladmin <command>" for a specific mysqld
 sub mtr_mysqladmin_start($$$) {
   my $srv= shift;
   my $command= shift;
@@ -738,9 +738,8 @@ sub mtr_mysqladmin_start($$$) {
   # Shutdown time must be high as slave may be in reconnect
   mtr_add_arg($args, "--shutdown_timeout=$adm_shutdown_tmo");
   mtr_add_arg($args, "$command");
-  my $path_mysqladmin_log= "$::opt_vardir/log/mysqladmin.log";
   my $pid= mtr_spawn($::exe_mysqladmin, $args,
-		     "", $path_mysqladmin_log, $path_mysqladmin_log, "",
+		     "", "", "", "",
 		     { append_log_file => 1 });
   mtr_verbose("mtr_mysqladmin_start, pid: $pid");
   return $pid;

mysql-test/mysql-test-run.pl

@@ -1887,19 +1887,6 @@ sub kill_running_servers () {
     # This is different from terminating processes we have
     # started from this run of the script, this is terminating
     # leftovers from previous runs.
-
-    if ( ! -d $opt_vardir )
-    {
-      if ( -l $opt_vardir and ! -d readlink($opt_vardir) )
-      {
-	mtr_report("Removing $opt_vardir symlink without destination");
-	unlink($opt_vardir);
-      }
-      # The "var" dir does not exist already
-      # the processes that mtr_kill_leftovers start will write
-      # their log files to var/log so it should be created
-      mkpath("$opt_vardir/log");
-    }
     mtr_kill_leftovers();
    }
 }