Adds bigip_dns_nameserver module (#48480)

This module can be used to manage DNS nameservers (usually used for
DNS express) functionality on a BIG-IP.

test/units/modules/network/f5/fixtures/load_ltm_dns_nameserver_1.json

@@ -0,0 +1,18 @@
+{
+    "kind": "tm:ltm:dns:nameserver:nameserverstate",
+    "name": "foo",
+    "partition": "Common",
+    "fullPath": "/Common/foo",
+    "generation": 8076,
+    "selfLink": "https://localhost/mgmt/tm/ltm/dns/nameserver/~Common~foo?ver=13.1.0.7",
+    "address": "127.0.0.1",
+    "port": 53,
+    "routeDomain": "/Common/0",
+    "routeDomainReference": {
+        "link": "https://localhost/mgmt/tm/net/route-domain/~Common~0?ver=13.1.0.7"
+    },
+    "tsigKey": "/Common/key1",
+    "tsigKeyReference": {
+        "link": "https://localhost/mgmt/tm/ltm/dns/tsig-key/~Common~key1?ver=13.1.0.7"
+    }
+}

test/units/modules/network/f5/test_bigip_dns_nameserver.py

@@ -0,0 +1,130 @@
+# -*- coding: utf-8 -*-
+#
+# Copyright: (c) 2018, F5 Networks Inc.
+# GNU General Public License v3.0 (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
+
+from __future__ import (absolute_import, division, print_function)
+__metaclass__ = type
+
+import os
+import json
+import sys
+
+from nose.plugins.skip import SkipTest
+if sys.version_info < (2, 7):
+    raise SkipTest("F5 Ansible modules require Python >= 2.7")
+
+from ansible.module_utils.basic import AnsibleModule
+
+try:
+    from library.modules.bigip_dns_nameserver import ApiParameters
+    from library.modules.bigip_dns_nameserver import ModuleParameters
+    from library.modules.bigip_dns_nameserver import ModuleManager
+    from library.modules.bigip_dns_nameserver import ArgumentSpec
+
+    # In Ansible 2.8, Ansible changed import paths.
+    from test.units.compat import unittest
+    from test.units.compat.mock import Mock
+    from test.units.compat.mock import patch
+
+    from test.units.modules.utils import set_module_args
+except ImportError:
+    try:
+        from ansible.modules.network.f5.bigip_dns_nameserver import ApiParameters
+        from ansible.modules.network.f5.bigip_dns_nameserver import ModuleParameters
+        from ansible.modules.network.f5.bigip_dns_nameserver import ModuleManager
+        from ansible.modules.network.f5.bigip_dns_nameserver import ArgumentSpec
+
+        # Ansible 2.8 imports
+        from units.compat import unittest
+        from units.compat.mock import Mock
+        from units.compat.mock import patch
+
+        from units.modules.utils import set_module_args
+    except ImportError:
+        raise SkipTest("F5 Ansible modules require the f5-sdk Python library")
+
+fixture_path = os.path.join(os.path.dirname(__file__), 'fixtures')
+fixture_data = {}
+
+
+def load_fixture(name):
+    path = os.path.join(fixture_path, name)
+
+    if path in fixture_data:
+        return fixture_data[path]
+
+    with open(path) as f:
+        data = f.read()
+
+    try:
+        data = json.loads(data)
+    except Exception:
+        pass
+
+    fixture_data[path] = data
+    return data
+
+
+class TestParameters(unittest.TestCase):
+    def test_module_parameters(self):
+        args = dict(
+            name='foo',
+            address='10.10.10.10',
+            service_port=80,
+            route_domain=20,
+            tsig_key='key1',
+            partition='Common'
+        )
+
+        p = ModuleParameters(params=args)
+        assert p.name == 'foo'
+        assert p.address == '10.10.10.10'
+        assert p.service_port == 80
+        assert p.route_domain == '/Common/20'
+        assert p.tsig_key == '/Common/key1'
+
+    def test_api_parameters(self):
+        args = load_fixture('load_ltm_dns_nameserver_1.json')
+
+        p = ApiParameters(params=args)
+        assert p.name == 'foo'
+        assert p.address == '127.0.0.1'
+        assert p.service_port == 53
+        assert p.route_domain == '/Common/0'
+        assert p.tsig_key == '/Common/key1'
+
+
+@patch('ansible.module_utils.f5_utils.AnsibleF5Client._get_mgmt_root',
+       return_value=True)
+class TestManager(unittest.TestCase):
+
+    def setUp(self):
+        self.spec = ArgumentSpec()
+
+    def test_create_monitor(self, *args):
+        set_module_args(dict(
+            name='foo',
+            address='10.10.10.10',
+            service_port=80,
+            route_domain=20,
+            tsig_key='key1',
+            partition='Common',
+            server='localhost',
+            password='password',
+            user='admin'
+        ))
+
+        module = AnsibleModule(
+            argument_spec=self.spec.argument_spec,
+            supports_check_mode=self.spec.supports_check_mode
+        )
+
+        # Override methods in the specific type of manager
+        mm = ModuleManager(module=module)
+        mm.exists = Mock(side_effect=[False, True])
+        mm.create_on_device = Mock(return_value=True)
+
+        results = mm.exec_module()
+
+        assert results['changed'] is True