cloudinit with jinja2 templates are prefixed with a `|\n`

[sgel-msw]

Hi,

I believe:
https://github.com/cloudify-incubator/cloudify-utilities-plugin/blob/master/cloudify_cloudinit/__init__.py#L56`

f['content'] = '|\n' + new_content

Is incorrect and it should not include '|\n'.

I believe the intent was that

write-files:
  content: |
       string

would have been the result, but that is not what the code does. The code simply is prefixing the string with | as the first line. Simply by changing f['content'] = '|\n' + new_content to f['content'] = new_content should fix the issue in all cases as then the cloud-init write-file looks like this.

write-files:
  contnet: "{\"parameter\": \"value\"}"

and this is also valid.

I changed the code on my system and tested it but only with using the jinja2 templating functionality.