Update scsi id boot from slof for ppc64le

New device serial will be added which caused the scsi device id
changed from 5 to 7. So we need to updated the scsi boot id from 5 to 7.

lib/bootloader_setup.pm

@@ -18,6 +18,7 @@ use utils;
 use version_utils qw(is_microos is_sle_micro is_jeos is_leap is_sle is_tumbleweed is_selfinstall);
 use mm_network;
 use Utils::Backends;
+use Data::Dumper;
 
 use backend::svirt qw(SERIAL_TERMINAL_DEFAULT_DEVICE SERIAL_TERMINAL_DEFAULT_PORT SERIAL_CONSOLE_DEFAULT_DEVICE SERIAL_CONSOLE_DEFAULT_PORT);
 
@@ -248,8 +249,22 @@ sub boot_local_disk {
         }
         if (match_has_tag 'inst-slof') {
             diag 'specifying local disk for boot from slof';
+            type_string_very_slow "devalias";
+            send_key 'ret';
+            save_screenshot;
             my $slof = 5;
-            $slof += 1 if get_var('VIRTIO_CONSOLE');
+	    my $file = './serial0';
+	    open (FILE, $file);
+	    my @content = <FILE>;
+	    close FILE;
+	    record_info("result is ", Dumper(@content));
+	    foreach my $line (@content) {
+	        if $line =~ /disk/ {
+	             record_info("result is ", $line);
+		     $slof = substr($line, -1);
+		}
+	    }
+	    #$slof = $out if get_var('VIRTIO_CONSOLE');
             type_string_very_slow "boot /pci\t/sc\t$slof";
             save_screenshot;
         }