[Bug 1178618] Re: --hotkey option does not work when the menu is hidden

[Franz Hsieh]

@colin
  I rewrite a new patch that:
  1. add --function-key option to read function key and set to "hotkey" environment variable.
  2. grub reads "hotkey" environment variable and boot to the entry at the start.
  3. add GRUB_HIDDEN_TIMEOUT_KEY variable in /etc/default/grub

  Note: Currently we only support one hotkey.

** Patch added: "ubuntu_quiet_hotkey.patch"
   https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1178618/+attachment/3701890/+files/ubuntu_quiet_hotkey.patch

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https://bugs.launchpad.net/bugs/1178618

Title:
  --hotkey option does not work when the menu is hidden

Status in GRand Unified Bootloader:
  New
Status in OEM Priority Project:
  Confirmed
Status in OEM Priority Project precise series:
  Confirmed
Status in “grub2” package in Ubuntu:
  Triaged

Bug description:
  
  Grub2 can detect key modifier status in 'sleep --interruptible', 
  so that you can interrupt the sleep by pressing Shift.
  (src: grub-core/commands/sleep.c)

  It will be useful if grub2 can also detect function key status,
  so user can boot to pre-defined grub menu entry by press specified
  function key.

  Here is a proposed command name and usage.

  - getfunctionkey -i {sec} {keyname}

  Here is an example of configuration that user can start memory test
  whiling he is pressing F9.

  ```
  if ! getfunctionkey -i 3 f9 ; then
  menuentry "Memory test (memtest86+)" {                                                                                                                                                                           
          insmod part_msdos
          insmod ext2
          set root='(hd0,msdos1)'
          search --no-floppy --fs-uuid --set=root d458babc-81f0-4dd7-ac88-410407141e2c
          linux16 /boot/memtest86+.bin
  }
  fi
  ```

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