Bug #54364 Allow multiple --experimental command line options for MTR

Convert --experimental into a multi option
Size of diff is caused by intenting code put into a for loop

mysql-test/lib/mtr_report.pm

@@ -124,7 +124,7 @@ sub mtr_report_test ($) {
     my $timest = format_time();
     my $fail = "fail";
 
-    if ( $::opt_experimental )
+    if ( @$::experimental_test_cases )
     {
       # Find out if this test case is an experimental one, so we can treat
       # the failure as an expected failure instead of a regression.

mysql-test/mysql-test-run.pl

@@ -187,7 +187,7 @@ our $opt_client_debugger;
 my $config; # The currently running config
 my $current_config_name; # The currently running config file template
 
-our $opt_experimental;
+our @opt_experimentals;
 our $experimental_test_cases;
 
 my $baseport;
@@ -846,7 +846,7 @@ sub command_line_setup {
              'big-test'                 => \$opt_big_test,
 	     'combination=s'            => \@opt_combinations,
              'skip-combinations'        => \&collect_option,
-             'experimental=s'           => \$opt_experimental,
+             'experimental=s'           => \@opt_experimentals,
 	     'skip-im'                  => \&ignore_option,
 
              # Specify ports
@@ -1028,16 +1028,19 @@ sub command_line_setup {
     mtr_print_thick_line('#');
   }
 
-  if ( $opt_experimental )
+  if ( @opt_experimentals )
   {
     # $^O on Windows considered not generic enough
     my $plat= (IS_WINDOWS) ? 'windows' : $^O;
 
-    # read the list of experimental test cases from the file specified on
+    # read the list of experimental test cases from the files specified on
     # the command line
-    open(FILE, "<", $opt_experimental) or mtr_error("Can't read experimental file: $opt_experimental");
-    mtr_report("Using experimental file: $opt_experimental");
     $experimental_test_cases = [];
+    foreach my $exp_file (@opt_experimentals)
+    {
+      open(FILE, "<", $exp_file)
+	or mtr_error("Can't read experimental file: $exp_file");
+      mtr_report("Using experimental file: $exp_file");
       while(<FILE>) {
 	chomp;
 	# remove comments (# foo) at the beginning of the line, or after a 
@@ -1066,6 +1069,7 @@ sub command_line_setup {
       }
       close FILE;
     }
+  }
 
   foreach my $arg ( @ARGV )
   {