gistfile1.txt

civix:
    symfony:
        database_driver: pdo_mysql
        database_host: 127.0.0.1
        database_port:
        database_name: civix
        database_user: civix
        database_password: civix

        mailer_transport: smtp
        mailer_host: 127.0.0.1
        mailer_user:
        mailer_password:

        locale: en
        secret: secret

        recaptcha_public_key: here_is_your_public_key
        recaptcha_private_key: here_is_your_private_key
        recaptcha_secure: false
        recaptcha_locale_key: kernel.default_locale
        recaptcha_enabled: true

        cicero_login: aplotnikov
        cicero_password: aplotnikov

        android_api_key: android_api_key
        android_app: app_key

        ios_is_sanbox: true
        ios_pem_path: /path/to/certs
        ios_passphrase: passphrase

        sunlightapi_token:

        stripe_api_key: sk_test_vpedTPsiXZZ8SSwS4isZzHWw
        stripe_publishable_key: pk_test_QUgSE3ZhORW9yoDuCkMjnaA2

        domain: example.com
        hostname: vagrant.local
        scheme: 'http'

        rabbitmq_connections:
            default:
                host: 'localhost'
                port: 5672
                user: 'guest'
                password: 'guest'
                vhost: '/'
                lazy: true

        slack_logger_token: 'xoxp'

gistfile2.txt

get-parameters:
  file.managed:
    - name: /srv/config/parameters.yml
    - mode: 644
    - user: {{ user }}
    - group: {{ user }}
    - contents_pillar: {{ salt['pillar.get']('civix:symphony', {})|yaml }}

Using the Pillar data as given above, I wrote the following source template, which I saved as /usr/local/etc/salt/states/test.yml:

{{ salt['pillar.get']('civix:symfony', {})|yaml(False) }}

Note the use of the flow control argument to the |yaml filter, which pretty-prints the resulting YAML document instead of putting it all on one line.

Then I wrote the following SLS file, which I saved as /usr/local/etc/salt/states/test.sls:

test_config:
  file.managed:
    - name: /tmp/parameters.yml
    - source: salt://test.yml
    - template: jinja

This Works For Me!(tm)

@xenophonf , fwiw i found this:

get-parameters:
  file.serialize:
    - name: /srv/config/parameters.yml
    - mode: 644
    - dataset_pillar: civix:symfony
    - formatter: yaml