Use pillar in salt

[MalloZup]

I think it would be preferable to have a pillar in params.sls with something like:

haproxy:
  image: haproxy:1.6.11

and then use here:

      image: {{ salt.caasp_registry.base_image_url() }}/{{ pillar['haproxy']['image'] }}

instead of this hardcoded version of the image.

Originally posted by @inercia in #747

[MalloZup]

see : #747 (comment)

[MalloZup]

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