feat: enable inventory-level nginx_extra_params

Pelayo Garcíarequested to merge
feat/nginx_xtra_params into master

Needed to add extra params to NGINX conf in CCEE.

This MR adds a variable nginx_inv_extra_params that is merged into the nginx_http_params variable of jdauphant.nginx role.

  • Source code changed.
  • Documented in README.

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