Specific settings are required for Debian jessie as it uses
different defaults from wheezy.
Additionally, we're going to attempt to ensure that the service
folder exists if we're using a systemd template upon install
as sometimes that folder may not be present on systems.
Added genisoimage as a fallback to mkisofs in configuration
drive generation.
Change-Id: I74bf93416513094293bc071fd40e62f4240d61bc
Closes-Bug: 1522552
a67004c0a3