Fix a parsing bug that prevents IPv6 addresses from being used with add_host

Closes #8682

test/units/plugins/action/test_add_host.py

@@ -0,0 +1,47 @@
+import unittest
+
+from ansible.plugins.action import add_host
+
+
+class TestAddHost(unittest.TestCase):
+
+    def test_hostname(self):
+        host, port = add_host._parse_ip_host_and_port('some-remote-host')
+        assert host == 'some-remote-host'
+        assert port is None
+
+    def test_hostname_with_port(self):
+        host, port = add_host._parse_ip_host_and_port('some-remote-host:80')
+        assert host == 'some-remote-host'
+        assert port == '80'
+
+    def test_parse_ip_host_and_port_v4(self):
+        host, port = add_host._parse_ip_host_and_port('8.8.8.8')
+        assert host == '8.8.8.8'
+        assert port is None
+
+    def test_parse_ip_host_and_port_v4_and_port(self):
+        host, port = add_host._parse_ip_host_and_port('8.8.8.8:80')
+        assert host == '8.8.8.8'
+        assert port == '80'
+
+    def test_parse_ip_host_and_port_v6(self):
+        host, port = add_host._parse_ip_host_and_port(
+            'dead:beef:dead:beef:dead:beef:dead:beef'
+        )
+        assert host == 'dead:beef:dead:beef:dead:beef:dead:beef'
+        assert port is None
+
+    def test_parse_ip_host_and_port_v6_with_brackets(self):
+        host, port = add_host._parse_ip_host_and_port(
+            '[dead:beef:dead:beef:dead:beef:dead:beef]'
+        )
+        assert host == 'dead:beef:dead:beef:dead:beef:dead:beef'
+        assert port is None
+
+    def test_parse_ip_host_and_port_v6_with_brackets_and_port(self):
+        host, port = add_host._parse_ip_host_and_port(
+            '[dead:beef:dead:beef:dead:beef:dead:beef]:80'
+        )
+        assert host == 'dead:beef:dead:beef:dead:beef:dead:beef'
+        assert port == '80'