Description of problem:
Cloud-init customisation templates are not applied.

Version-Release number of selected component (if applicable):
cfme-vsphere-5.6.0.6-1.x86_64.vsphere.ova

How reproducible:
Provision Linux workload from private template, se

Steps to Reproduce:
1. Select private Linux template which has cloud-init installed
2. Compute > Clouds > Instances > Provision Instance > [select image]
3. Complete provisioning dialogues
4. Select cloud-init customisation template

Actual results:
Customisation template is not applied.

Expected results:
Customisation template applied.

Additional info:
Reviewing /var/lib/waagent/ovf-env.xml on the deployed instance, customdata is present.

<ns1:CustomData>STJOc2IzVmtMV052Ym1acFp3cDNjbWwwWlY5bWFXeGxjem9LSUNBdElIQmhkR2c2SUM5MFpYTjBMblI0CmRBb2dJQ0FnWTI5dWRHVnVkRG9nZkFvZ0lDQWdJQ0JJWlhKbElHbHpJR0VnYkdsdVpTNEtJQ0FnSUNBZwpRVzV2ZEdobGNpQnNhVzVsSUdseklHaGxjbVV1Cg==</ns1:CustomData>

However, it is decoded twice:
Base64.decode64(Base64.decode64(s))
=> "#cloud-config\nwrite_files:\n  - path: /test.txt\n    content: |\n      Here is a line.\n      Another line is here."

Looking at app/models/manageiq/providers/azure/cloud_manager/provision/cloning.rb, the custom_data function is encoding an already encoded value.

Here is a suggested fix:

def custom_data
    # Base64.encode64(userdata_payload.encode("UTF-8")).delete("\n")
    userdata_payload.delete("\n")
end