When converting variable history file names to relative
paths, keep the layer directory's name so that the user
can distinguish between conf files with the same name.
[YOCTO #8188]
(Bitbake rev: 59561d652af91c2099b735084f0e44275d68e637)
Signed-off-by: David Reyna <david.reyna@windriver.com>
Signed-off-by: Michael Wood <michael.g.wood@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>