Correct configdrive creation
Correct configdrive creation

Per jroll in #openstack-ironic, the configdrive format is gzipped,
and then base64 encoded.

devananda/bifrost,openstack/bifrost,bcornec/bifrost,openstack/bifrost,juliakreger/bifrost,juliakreger/bifrost,devananda/bifrost,EntropyWorks/bifrost,bcornec/bifrost,EntropyWorks/bifrost