New dnsrecord management module.

There is a new dnsrecord managem module placed in the plugins folder:

    plugins/modules/ipadnsrecord.py

The dnsrecord module allows management of DNS records and is as compatible
as possible with the Ansible upstream `ipa_dnsrecord` module, but provide
some other features like multiple record management in one execution,
support for more DNS record types, and more.

Here is the documentation for the module:

    README-dnsrecord

New example playbooks have been added:

    playbooks/dnsrecord/ensure-dnsrecord-is-absent.yml
    playbooks/dnsrecord/ensure-dnsrecord-is-present.yml
    playbooks/dnsrecord/ensure-presence-multiple-records.yml
    playbooks/dnsrecord/ensure-dnsrecord-with-reverse-is-present.yml
    playbooks/dnsrecord/ensure-multiple-A-records-are-present.yml
    playbooks/dnsrecord/ensure-A-and-AAAA-records-are-absent.yml
    playbooks/dnsrecord/ensure-A-and-AAAA-records-are-present.yml
    playbooks/dnsrecord/ensure-CNAME-record-is-absent.yml
    playbooks/dnsrecord/ensure-CNAME-record-is-present.yml
    playbooks/dnsrecord/ensure-MX-record-is-present.yml
    playbooks/dnsrecord/ensure-PTR-record-is-present.yml
    playbooks/dnsrecord/ensure-SRV-record-is-present.yml
    playbooks/dnsrecord/ensure-SSHFP-record-is-present.yml
    playbooks/dnsrecord/ensure-TLSA-record-is-present.yml
    playbooks/dnsrecord/ensure-TXT-record-is-present.yml
    playbooks/dnsrecord/ensure-URI-record-is-present.yml

New tests for the module can be found at:

    tests/dnsrecord/test_dnsrecord.yml
    tests/dnsrecord/test_compatibility_with_ansible_module.yml
    tests/dnsrecord/test_dnsrecord_full_records.yml