gnu-efi: Add native support

There are tools such as sbsigntool that require a native version
gnu-efi. Add support for building gnu-efi-native.

Cc: Stefan Stanacar <stefanx.stanacar@intel.com>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
recipes-devtools: Add sbsigntool recipe

sbsigntool is a useful utility for cryptographically signing binaries
for use in UEFI systems.

Signed-off-by: Matt Fleming <matt.fleming@intel.com>
sbsigntool: Add missing patch to disable man pages generation

The tool cannot be built without this patch. We don't really need
the man pages in this project.

Signed-off-by: Ricardo Neri <ricardo.neri-calderon@linux.intel.com>
luv-test-manager: Be more verbose on what do when tests are complete

LuvOS is intended to be an automated testing tool. Thus, it does really
require much interaction from the user other than inserting the bootable
media, and removing it when tests are complete. Thus, we inform better
to the user what to do when the tests are complete.

Signed-off-by: Ricardo Neri <ricardo.neri-calderon@linux.intel.com>