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For improved flexibility and maintainability.

* Update tasks in node role to use 'group_name_master' variable instead
  of hardcoded 'master' group name
* Update tasks in master role to use 'group_name_master' variable instead
  of hardcoded 'master' group name
* Update tasks in post role to use 'group_name_master' variable instead of
  hardcoded 'master' group name