Prepare a Virtual Machine Template for Raw Data cloud-init Customization

The following steps prepare a virtual machine template for customization with raw cloud-init data.

In the guest operating system, install open-vm-tools version 11.3.0 or later. Configure the Linux guest to run open-vm-tools services when the guest operating system starts.
Example for an Ubuntu 20.04 guest operating system:
```
$ sudo apt update
$ sudo apt install open-vm-tools
$ sudo vmtoolsd -v
$ sudo systemctl is-enabled open-vm-tools.service
```
In the guest operating system, install cloud-init version 21.1 or later. Configure the Linux guest to run cloud-init services when the guest operating system starts.
Example for an Ubuntu 20.04 guest operating system:
```
$ sudo apt update
$ sudo apt install cloud-init
$ sudo cloud-init -v
$ sudo systemctl is-enabled cloud-init.service
$ sudo systemctl is-enabled cloud-init-local.service
```
Configure cloud-init to accept the OVF data source for VMware raw cloud-init configuration.
Edit the cloud-init configuration file in /etc/cloud/cloud.cfg or in /etc/cloud/cloud.cfg.d/*, depending on the Linux distribution. Add OVF to the list of datasources accepted by cloud-init.
Example line for cloud-init version 21.3:
```
datasource_list: [ NoCloud, ConfigDrive, Azure, OVF, OpenStack, Ec2 ]
```
Configure cloud-init to enable VMware customization with raw cloud-init data.
Edit the cloud-init configuration file in /etc/cloud/cloud.cfg or in /etc/cloud/cloud.cfg.d/*, depending on the Linux distribution. Set the flag disable_vmware_customization to true and set the flag allow_raw_data to true. If customization time-out is an issue, you can set the value of vmware_cust_file_max_wait (default: 15 seconds).
Example lines for cloud-init version 21.3:
```
disable_vmware_customization: true
datasource:
  OVF:
    allow_raw_data: true
vmware_cust_file_max_wait: 25
```
Run the cloud-init clean step to remove any artifacts from previous configuration failures.
```
$ sudo cloud-init clean
```
Power off the virtual machine template.
```
$ sudo poweroff
```