Comment 0 for bug 1061964

Openstack writes out a metadata file with 'hostname' but most of cloud-init does not use this as the primary 'hostname' but instead uses 'local-hostname' (main effect being that the instance doesn't get named right when the set/update hostname modules are ran). So perform a similar action like the OVF datasource where we ensure that 'hostname' is copied over to 'local-hostname' if that key exists (and 'local-hostname' doesn't).