Release 4.5.0

[lucab]

Changes:

• providers: add a new openstack platform
• openstack: use config-drive by default and metadata API as fallback
• azure: rework ready-state posting
• azure: log a warning on network failure if non-root
• providers: add a new vultr platform
• systemd: activate relevant services on Vultr

[lucab]

There is an unrelated but funny failure in Jenkins:

    --- FAIL: fcos.filesystem/writabledirs (0.15s)
            files.go:132: Unknown writable directories found: /usr/lib/dracut/modules.d/10coreos-sysctl
    /usr/lib/dracut/modules.d/15coreos-network
    /usr/lib/dracut/modules.d/20live
    /usr/lib/dracut/modules.d/30ignition-coreos
    /usr/lib/dracut/modules.d/40ignition-conf
    /usr/lib/dracut/modules.d/40ignition-ostree
    /usr/lib/dracut/modules.d/50coreos-kernel
    /usr/lib/dracut/modules.d/99emergency-timeout
    /usr/lib/dracut/modules.d/99journal-conf
    /usr/lib/systemd/journald.conf.d
    /usr/lib/systemd/system/emergency.service.d
    /usr/lib/systemd/system/rescue.service.d

[jlebon]

LGTM. Restarted CI now that coreos/coreos-ci-lib#34 is merged, though hoping we get to the bottom of that.

[bgilbert]

openstack: use config-drive by default and metadata API as fallback

This should probably mention the consequences for platform ID.