Commits on Apr 4, 2016

1. Introducing ostree-grub-generator …

   ostree-grub-generator can be used to customize
   the generated grub.cfg file. Compile time
   decision ostree-grub-generator vs grub2-mkconfig
   can be overwritten with the OSTREE_GRUB2_EXEC
   envvar - useful for auto tests and OS installers.
   
   Why this alternative approach:
   
   1) The current approach is less flexible than using a
      custom 'ostree-grub-generator' script. Each system can
      adjust this script for its needs, instead of using the
      hardcoded values from ostree-bootloader-grub2.c.
   
   2) Too much overhead on embedded to generate grub.cfg
      via /etc/grub.d/ configuration files. It is still
      possible to do so, even with this patch applied.
      No need to install grub2 package on a target device.
   
   3) The grub2-mkconfig code path has other issues:
      https://bugzilla.gnome.org/show_bug.cgi?id=761180
   
   Task: https://bugzilla.gnome.org/show_bug.cgi?id=762220

   Gatis Paeglis committed Apr 4, 2016
   Configuration menu

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