[Unity] Add release note and tests for IPv6 fix

Add the release note
The IPv6 format need change to [ipv6]

Change-Id: Iee4506081f361850907019b511ac2d13b17b1a9a
Closes-bug: #1845135

manila/tests/share/drivers/dell_emc/plugins/unity/mocked_unity.yaml

@@ -190,6 +190,9 @@ unity_base: &unity_base
 test_connect: &test_connect
   unity: *unity_base
 
+test_connect_with_ipv6: &test_connect_with_ipv6
+  unity: *unity_base
+
 test_dhss_false_connect: &test_dhss_false_connect
   unity: *unity_base
 

manila/tests/share/drivers/dell_emc/plugins/unity/res_mock.py

@@ -100,6 +100,21 @@ class FakeEMCShareDriver(object):
         self.configuration.local_conf.max_over_subscription_ratio = 20
 
 
+class FakeEMCShareDriverIPv6(object):
+    def __init__(self, dhss=None):
+        if dhss in (True, False):
+            CONF.set_default('driver_handles_share_servers', dhss)
+        self.configuration = conf.Configuration(None)
+        self.configuration.emc_share_backend = 'unity'
+        self.configuration.emc_nas_server = 'fa27:2a95:e734:0:0:0:0:01'
+        self.configuration.emc_nas_login = 'fake_user'
+        self.configuration.emc_nas_password = 'fake_password'
+        self.configuration.share_backend_name = 'EMC_NAS_Storage'
+        self.configuration.vnx_server_meta_pool = 'nas_server_pool'
+        self.configuration.unity_server_meta_pool = 'nas_server_pool'
+        self.configuration.local_conf.max_over_subscription_ratio = 20
+
+
 STATS = dict(
     share_backend_name='Unity',
     vendor_name='EMC',

manila/tests/share/drivers/dell_emc/plugins/unity/test_connection.py

@@ -38,6 +38,11 @@ class TestConnection(test.TestCase):
     def test_connect(self, connection):
         connection.connect(res_mock.FakeEMCShareDriver(dhss=True), None)
 
+    @res_mock.patch_connection_init
+    def test_connect_with_ipv6(self, connection):
+        connection.connect(res_mock.FakeEMCShareDriverIPv6(
+            dhss=True), None)
+
     @res_mock.patch_connection
     def test_connect__invalid_pool_configuration(self, connection):
         f = connection.client.system.get_pool

releasenotes/notes/bug-1845135-fix-Unity-cannot-use-mgmt-ipv6-9407710a3fc7f4aa.yaml

@@ -0,0 +1,5 @@
+---
+fixes:
+  - |
+    Fixed an issue with the Dell EMC Unity driver to work with
+    a management IP configured in IPv6 format.