scripts: Add few scripts from SHR staging feeds

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
layers: Bump bitbake, oe-core, meta-oe and meta-qt5 revisions

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
setup-env: set MACHINE=qemux86 by default

Signed-off-by: Christophe Chapuis <chris.chapuis@gmail.com>