This wks is just a copy of gummiboot wks with bootloader
changed to systemd-boot. A very basic boot test on a X86
target is done with a direct-boot image generated by:

wic create mksystemd-bootdisk -e core-image-minimal

Because we plan to replace gummiboot with systemd-boot at any
time in the future, we summarize history (as much as I can) of
the current gummiboot wks before it's gone:

-----------------------------------------------------------------
commit 7d4bb40905fab38fb3db1d0e17afbc803622f00c
Author: Ed Bartosh <ed.bartosh@linux.intel.com>
Date:   Wed Sep 2 13:58:02 2015 +0300

    wic: get rid of scripts/lib/image

    Moved content of scripts/lib/image/ to scripts/lib/wic as
    one directory with the same name as a tool is self-explanatory
    and less confusing than two.

    (From OE-Core rev: 5dc02d572794298b3362378cea3d7da654456c44)

    Signed-off-by: Ed Bartosh <ed.bartosh@linux.intel.com>
    Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

commit 77561e719181d58289687373eebadce764f838a7
Author: Ed Bartosh <ed.bartosh@linux.intel.com>
Date:   Wed Sep 2 13:58:01 2015 +0300

    wic: use ext4 in canned .wks files

    Latest kernel doesn't have ext3 compiled in. Wic images produced
    from canned .wks can't boot because of that. Switching to ext4
    fixes this issue.

    (From OE-Core rev: d281a65a81f369fc8d75023b8f911ce4106969c1)

    Signed-off-by: Ed Bartosh <ed.bartosh@linux.intel.com>
    Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

commit 072657ce98414afdd6f68941847e21fc5ce496c7
Author: Tom Zanussi <tom.zanussi@linux.intel.com>
Date:   Mon Aug 11 20:35:41 2014 -0500

    wic: Add mkgummidisk kickstart file

    This is the same as mkefidisk but uses gummiboot instead of grub-efi.

    (From OE-Core rev: 5979409ebfab0bb07b3c2b2fcf14a722c441f07b)

    Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
    Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
-----------------------------------------------------------------

Signed-off-by: Jianxun Zhang <jianxun.zhang@linux.intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>

In order to give and example of 'include' feature of ks parser
and for testing purposes common parts of 3 canned wks files were
moved into common.wks.inc

Signed-off-by: Ed Bartosh <ed.bartosh@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

Add new wks file as a example for a custom bootloader configuration.
This change also includes the configuration that file that will be
used.

This example is using syslinux with MBR, the configuration file is
almost the same as the one generated by wic. As stated before this
is just an example.

[YOCTO #8728]

Signed-off-by: Mariano Lopez <mariano.lopez@linux.intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>

Moved content of scripts/lib/image/ to scripts/lib/wic as
one directory with the same name as a tool is self-explanatory
and less confusing than two.

Signed-off-by: Ed Bartosh <ed.bartosh@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>