disable getopt prefix matching in mtr bootstrap

it was disabled in mtr tests in 4280b25e

mysql-test/mysql-test-run.pl

@@ -3105,6 +3105,7 @@ sub mysql_install_db {
   my $args;
   mtr_init_args(\$args);
   mtr_add_arg($args, "--no-defaults");
+  mtr_add_arg($args, "--disable-getopt-prefix-matching");
   mtr_add_arg($args, "--bootstrap");
   mtr_add_arg($args, "--basedir=%s", $install_basedir);
   mtr_add_arg($args, "--datadir=%s", $install_datadir);

mysql-test/r/mysqld--help.result

@@ -1200,7 +1200,7 @@ ft-query-expansion-limit 20
 ft-stopword-file (No default value)
 gdb FALSE
 general-log FALSE
-getopt-prefix-matching TRUE
+getopt-prefix-matching FALSE
 group-concat-max-len 1024
 gtid-domain-id 0
 gtid-ignore-duplicates FALSE

mysql-test/suite/perfschema/r/bad_option_2.result

-Found: ambiguous option '--performance-schema-max_=12'
+FOUND /ambiguous option '--performance-schema-max_=12'/ in bad_option_2.txt

mysql-test/suite/perfschema/t/bad_option_2.test

@@ -8,26 +8,9 @@ let $outfile= $MYSQLTEST_VARDIR/tmp/bad_option_2.txt;
 --error 0,1
 --remove_file $outfile
 --error 3
---exec $MYSQLD_BOOTSTRAP_CMD --loose-console --performance-schema-max_=12 > $outfile 2>&1
-
-perl;
-    use strict;
-    use warnings;
-    my $fname= "$ENV{'MYSQLTEST_VARDIR'}/tmp/bad_option_2.txt";
-    open(FILE, "<", $fname) or die;
-    my @lines= <FILE>;
-    # those must be in the file for the test to pass
-    my @patterns=
-      ("ambiguous option '--performance-schema-max_=12'");
-    foreach my $one_line (@lines)
-    {
-      foreach my $one_pattern (@patterns)
-      {
-        # print pattern, not line, to get a stable output
-        print "Found: $one_pattern\n" if ($one_line =~ /$one_pattern/);
-      }
-    }
-    close FILE;
-EOF
+--exec $MYSQLD_BOOTSTRAP_CMD --loose-console --enable-getopt-prefix-matching --performance-schema-max_=12 > $outfile 2>&1
+--let SEARCH_PATTERN=ambiguous option '--performance-schema-max_=12'
+--let SEARCH_FILE=$outfile
+--source include/search_pattern_in_file.inc
 --remove_file $outfile