instead of using the keys generated inside build/key by
coreos-init-buildenv, we use a fixed set of keys by default
so that we can share the sstate output that use thoses keys to
share binaries between the CI state server and developers local
installation.
- replace PRODUCT by NWL in nwl-init-build-env
- add meta-nwl-distro to bblayers.conf.sample
- remove the meta-belden-coreos-demo layers by default
- add some branding
Squashed commit of the following:
commit e3ece0d4f75e6f37accd731f70c0071f3643b62a
commit 3c7e0567e523c6d2951883089e4944aa32d6a150
commit 29065139af735c71478d14c2316af80309bcaa1d
Signed-off-by: Patrick Zysset <patrick.zysset@netmodule.com>