qemuboot: Improve relative path handling
qemuconf files are currently written relative to TOPDIR. What
makes more sense is to write paths relative to the location of the
file. This makes moving them around and decoding the end paths in
runqemu much easier.
The effect of this should allow less use of bitbake to determine
variables and allow us to simplify runqemu.
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit
55a0028a961c0ad3c2e5729a9e3919cbbf256fe1)
Signed-off-by: Armin Kuster <akuster808@gmail.com>
