Remove unnecessary unicode conversions from parse_kv

Fixes #8425

test/integration/unicode.yml

@@ -40,3 +40,4 @@
   gather_facts: true
   tasks:
     - debug: msg='Unicode is a good thing ™'
+    - debug: msg=АБВГД

test/units/TestUtils.py

@@ -165,6 +165,8 @@ class TestUtils(unittest.TestCase):
     def test_parse_kv_basic(self):
         self.assertEqual(ansible.utils.parse_kv('a=simple b="with space" c="this=that"'),
                 {'a': 'simple', 'b': 'with space', 'c': 'this=that'})
+        self.assertEqual(ansible.utils.parse_kv('msg=АБВГД'),
+                {'msg': 'АБВГД'})
 
 
     def test_jsonify(self):