fix hosts template

Student User

2020-02-19 26d781da63ad0368921d6a0eb1f5efcb9bc479d1

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---
- name: stub print vars
  hosts: localhost
  become: false
  tasks:
    - name: print a var
      debug:
        msg:
          - Line 1
          - var '{{ myvar }}'
          - Line 2