Add option to boot local drive to the x86 BIOS grub2 menu

Add menus to chainload the first and second drive to the Troubleshooting
menu.

share/templates.d/99-generic/config_files/x86/grub2-bios.cfg

@@ -9,6 +9,7 @@ set gfxpayload=keep
 insmod gzio
 insmod part_gpt
 insmod ext2
+insmod chain
 
 set timeout=60
 ### END /etc/grub.d/00_header ###
@@ -33,4 +34,10 @@ submenu 'Troubleshooting -->' {
 		linux @KERNELPATH@ @ROOT@ inst.rescue quiet
 		initrd @INITRDPATH@
 	}
+	menuentry 'Boot first drive' --class fedora --class gnu-linux --class gnu --class os {
+		chainloader (hd0)+1
+	}
+	menuentry 'Boot second drive' --class fedora --class gnu-linux --class gnu --class os {
+		chainloader (hd1)+1
+	}
 }