Remove dependency to cloud-init

Cloud init is not enabled by default in images because it does not make
sense for local hypervisor images. However, mgmt.git still has a
dependency to it via the obsolete "osvinit" name which causes OSv
"default" images to always include cloud-init.

Reviewed-by: Tomasz Grabiec <tgrabiec@gmail.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>