Add policy_by_role

[spuder]

This module can lookup policies by name with the following attribute

consul_token {'test_token':
  policies_by_name  => [
   'test_policy'
  ],

It would be nice if it could also lookup policies by role. Roles were introduced in consul 1.5

https://www.consul.io/docs/commands/acl/role.html

consul_token {'test_token':
  policies_by_role => [
  'test_role'
],

[stale]

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