win_dns_zone does not handle forwarders correctly

[BoldlyGoingNoWhre]

SUMMARY

Plays that have forwarders (non replicated) in them are not idempotent and fail to update

ISSUE TYPE

• Bug Report

COMPONENT NAME

win_dns_zone

ANSIBLE VERSION

ansible 2.9.6
  config file = /etc/ansible/ansible.cfg
  configured module search path = ['/home/pvandepu/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/lib/python3/dist-packages/ansible
  executable location = /usr/bin/ansible
  python version = 3.8.5 (default, Jan 27 2021, 15:41:15) [GCC 9.3.0]

CONFIGURATION

n/a

OS / ENVIRONMENT

target OS Windows 2021 R2

STEPS TO REPRODUCE

- name: Create DNS forwarder
      community.windows.win_dns_zone:
        name: myowndnszone.loc
        type: forwarder
        dns_servers:
          - 1.1.1.1
          - 2.2.2.2

EXPECTED RESULTS

DNS conditional forwarder zone is created / updated / unchanged if OK

ACTUAL RESULTS

DNS conditional forwarder zone is created if not exists (OK)
running the same play a second time results in error, running play with changed values results in error

FAILED! => {"changed": false, "msg": "Failed to set properties on the zone myowndnszone.loc: Cannot validate argument on parameter 'ReplicationScope'. The argument \"None\" does not belong to the set \"Forest,Domain,Legacy,Custom\" specified by the ValidateSet attribute. Supply an argument that is in the set and then try the command again."}

[jborean93]

This is fixed with #260.