ktest.pl: Avoid false positives with grub2 skip regex

Some distros have grub2 config files with the lines

    if [ x"${feature_menuentry_id}" = xy ]; then
      menuentry_id_option="--id"
    else
      menuentry_id_option=""
    fi

which match the skip regex defined for grub2 in get_grub_index():

    $skip = '^\s*menuentry';

These false positives cause the grub number to be higher than it
should be, and the wrong kernel can end up booting.

Grub documents the menuentry command with whitespace between it and the
title, so make the skip regex reflect this.

Link: https://lore.kernel.org/[email protected]
Signed-off-by: Daniel Jordan <[email protected]>
Acked-by: John 'Warthog9' Hawley (Tenstorrent) <[email protected]>
Signed-off-by: Steven Rostedt <[email protected]>

Author: danieljordan10

tools/testing/ktest/ktest.pl

@@ -2056,7 +2056,7 @@ sub get_grub_index {
     } elsif ($reboot_type eq "grub2") {
 	$command = "cat $grub_file";
 	$target = '^\s*menuentry.*' . $grub_menu_qt;
-	$skip = '^\s*menuentry';
+	$skip = '^\s*menuentry\s';
 	$submenu = '^\s*submenu\s';
     } elsif ($reboot_type eq "grub2bls") {
 	$command = $grub_bls_get;