Actual hosts:
crwmi-dev
crwmi-test
crwmi-stg
crwmi-prod

Want to change the user_agent based on which server I am pushing the config to:
crwmi-dev = "CRDEV"
crwmi-test = "CRTESTFARM"
crwmi-stg = "CRSTAGEFARM"
crwmi-prod = "CRFARM"


contents of salt://trapmail/init.sls
-----
/usr/local/bin/trapmail:
  file.managed:
    - source: salt://trapmail/trapmail.notreal
    - template: jinja
    - context:
      {% if grains['host'] == 'crwmi-dev' %}
    user_agent: "CRDEV"
      {% elseif grains['host'] == 'crwmi-test' %}
    user_agent: "CRDEV"
      {% elseif grains['host'] == 'crwmi-stg' %}
    user_agent: "CRDEV"
      {% elseif grains['host'] == 'crwmi-prod' %}
    user_agent: "CRDEV"
      {% endif %}


contents of salt://trapmail/trapmail.notreal
-----
user_agent: {{ user_agent }}