New DNSConfig management module

There is a new vaultcontainer management module placed in the plugins folder:

plugins/modules/ipadnsconfig.py

The dnsconfig module allows to modify global DNS configuration.

Here is the documentation for the module:

README-dnsconfig.md

New example playbooks have been added:

playbooks/dnsconfig/set_configuration.yml
playbooks/dnsconfig/disable-global-forwarders.yml
playbooks/dnsconfig/disallow-reverse-sync.yml

New tests for the module:

tests/dnsconfig/test_dnsconfig.yml

README-dnsconfig.md

@@ -0,0 +1,140 @@
+DNSConfig module
+============
+
+Description
+-----------
+
+The dnsconfig module allows to modify global DNS configuration.
+
+
+Features
+--------
+* Global DNS configuration
+
+
+Supported FreeIPA Versions
+--------------------------
+
+FreeIPA versions 4.4.0 and up are supported by the ipadnsconfig module.
+
+
+Requirements
+------------
+
+**Controller**
+* Ansible version: 2.8+
+
+**Node**
+* Supported FreeIPA version (see above)
+
+
+Usage
+=====
+
+Example inventory file
+
+```ini
+[ipaserver]
+ipaserver.test.local
+```
+
+Example playbook to set global DNS configuration:
+
+```yaml
+---
+- name: Playbook to handle global DNS configuration
+  hosts: ipaserver
+  become: true
+
+  tasks:
+  # Set dnsconfig.
+  - ipadnsconfig:
+      forwarders:
+        - ip_address: 8.8.4.4
+        - ip_address: 2001:4860:4860::8888
+          port: 53
+      forward_policy: only
+      allow_sync_ptr: yes
+```
+
+Example playbook to ensure a global forwarder, with a custom port, is absent:
+
+```yaml
+---
+- name: Playbook to handle global DNS configuration
+  hosts: ipaserver
+  become: true
+
+  tasks:
+  # Ensure global forwarder with a custom port is absent.
+  - ipadnsconfig:
+      forwarders:
+          - ip_address: 2001:4860:4860::8888
+            port: 53
+      state: absent
+```
+
+Example playbook to disable global forwarders:
+
+```yaml
+---
+- name: Playbook to disable global DNS forwarders
+  hosts: ipaserver
+  become: true
+
+  tasks:
+  # Disable global forwarders.
+  - ipadnsconfig:
+      forward_policy: none
+```
+
+Example playbook to change global forward policy:
+
+```yaml
+---
+- name: Playbook to change global forward policy
+  hosts: ipaserver
+  become: true
+
+  tasks:
+  # Disable global forwarders.
+  - ipadnsconfig:
+      forward_policy: first
+```
+
+Example playbook to disallow synchronization of forward (A, AAAA) and reverse (PTR) records:
+
+```yaml
+---
+- name: Playbook to disallow reverse synchronization.
+  hosts: ipaserver
+  become: true
+
+  tasks:
+  # Disable global forwarders.
+  - ipadnsconfig:
+      allow_sync_ptr: no
+```
+
+Variables
+=========
+
+ipadnsconfig
+------------
+
+Variable | Description | Required
+-------- | ----------- | --------
+`ipaadmin_principal` | The admin principal is a string and defaults to `admin` | no
+`ipaadmin_password` | The admin password is a string and is required if there is no admin ticket available on the node | no
+`forwarders` | The list of forwarders dicts. Each `forwarders` dict entry has:| no
+  | `ip_address` - The IPv4 or IPv6 address of the DNS server. | yes
+  | `port` - The custom port that should be used on this server. | no
+`forward_policy` | The global forwarding policy. It can be one of `only`, `first`, or `none`.  | no
+`allow_sync_ptr` | Allow synchronization of forward (A, AAAA) and reverse (PTR) records (bool). | yes
+`state` | The state to ensure. It can be one of `present` or `absent`, default: `present`. | yes
+
+
+Authors
+=======
+
+Rafael Guterres Jeffman