When OVA template is not being used, the default dhcp value yes will
trigger cloud-init to generate a 00-.network file, which will break
network connectivity Intermittently. Please see the details here:
https://github.com/coreos/bugs/issues/1802#issuecomment-297847614
This reverts commit 39bb800f16.
This change disabled a number of features so it isn't suitable for the
generic VMware templates. We need to re-trace our steps to list exactly
what tools/systems weren't accepting the linux26 type.
