[YOCTO #8017] - selftest does not use pkill qemu
[YOCTO #7976] - tests do not touch .ssh/known_hosts
- don't hardcode qemu IP
[YOCTO #8027] - use qemu nographic
Extra: removed unnecessary assert for bitbake and runCmd status
(From OE-Core rev: f58df3a630b774083934171463b2b07add29dc0e)
Signed-off-by: Daniel Istrate <daniel.alexandrux.istrate@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>