fix issue: Installation failed on RH 7 - st2chatops service not found

[dove-young]

Fix issue https://github.com/StackStorm/ansible-st2/issues/262

- name: daemon-reload
  become: yes
  command: systemctl daemon-reload
  

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[arm4b]

Closed together with https://github.com/StackStorm/ansible-st2/issues/262