[Bug 1178618] [NEW] add a command to detect function key status.

[Hsin-Yi, Chen (hychen)]

Public bug reported:


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
```

** Affects: grub
     Importance: Undecided
         Status: New

** Affects: oem-priority
     Importance: High
         Status: New

** Affects: oem-priority/precise
     Importance: High
         Status: New

** Affects: grub2 (Ubuntu)
     Importance: Undecided
         Status: New

** Also affects: grub
   Importance: Undecided
       Status: New

** Also affects: oem-priority
   Importance: Undecided
       Status: New

** Also affects: oem-priority/precise
   Importance: Undecided
       Status: New

** Changed in: oem-priority
   Importance: Undecided => High

** Changed in: oem-priority/precise
   Importance: Undecided => High

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

Title:
  add a command to detect function key status.

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

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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