Install openstack-m-repo element
Fix unbound $USER variable

In case $USER doesn't exist set a default one.
Fix missing /root/.ssh/authorized_keys

Check if the /root/.ssh/authorized_keys exists, if not create it and
set the right permissions.
Workaround for init-keystone

As we are installing the openstack services using packages the venvs
will not be created, but init-keystone is calling keystone-manage from
inside a venv so we need to fake it.
Unmount /run/netns at the end of %post

If it's hanging will cause the rootfs to fail to unmount.