Add ability to deploy OVF/VM template from Content Library in vsphere-clone

[ghost]

This issue was originally opened by @blind-gh0st as hashicorp/packer#11000. It was migrated here as a result of the Packer plugin split. The original body of the issue is below.

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Description

Currently Packer's vsphere-clone builder allows the creation of a new VM from a template using the template: keyword in the JSON configuration. However, should one define a template using a Content Library path Packer cannot find the template. This feature request is to add the ability to define a template from a Content Library for Packer to deploy.

Use Case(s)

Use case would be any time someone is wanting to deploy a VM to a clustered environment. Having a shared Content Library is useful for those configurations and Packer already supports the ability to use Content Libraries for ISOs in vsphere-iso. This would be similar functionality, just using VM templates in vsphere-clone.

Potential configuration

It seems govc already supports doing this using the library.deploy command and giving a path. We may need a new keyword to differentiate between a Content Library path and the VM template functionality already present.

Potential References

https://github.com/vmware/govmomi/blob/master/govc/USAGE.md
https://discuss.hashicorp.com/t/is-it-possible-to-use-an-ovf-template-from-vspheres-content-library-for-vsphere-clone/24117

[sylviamoss]

Duplicate of #43

[azr]

Closing in favor of #43