Unable to customize linux VM using cloudinit on RHEV 3.5.5

Issue

• Trying to provision VMs in a CloudForms 4.0 + RHEV 3.5.5 environment. Added an simple cloudinit script:

# cloud-config
runcmd:
- echo "OK..." > /etc/motd

While provisioning a VM via Infrastructure --> Virtual Machines --> Lifecycle --> Provision VMs, select the cloudinit script. But after cloning the template, the cloudinit scripts does not get injected to the provisioned VM:

- /var/lib/cloud/instance/user-data.txt is empty
- /var/lib/cloud/instance/datasource.txt does not include "DataSourceConfigDrive" (attached as datasource_3.5.5.txt)
- cloudinit service waits for user data during boot, and times out eventually - please see the attached /var/log/boot.log for details (attached as boot_3.5.5.log)