Move uses of to_bytes, to_text, to_native to use the module_utils version (#17423)

We couldn't copy to_unicode, to_bytes, to_str into module_utils because
of licensing.  So once created it we had two sets of functions that did
the same things but had different implementations.  To remedy that, this
change removes the ansible.utils.unicode versions of those functions.

test/units/parsing/yaml/test_loader.py

@@ -32,7 +32,6 @@ from ansible.parsing.yaml.loader import AnsibleLoader
 from ansible.parsing import vault
 from ansible.parsing.yaml.objects import AnsibleVaultEncryptedUnicode
 from ansible.parsing.yaml.dumper import AnsibleDumper
-from ansible.utils.unicode import to_bytes
 
 from units.mock.yaml_helper import YamlTestUtils
 
@@ -41,6 +40,7 @@ try:
 except ImportError:
     from yaml.parser import ParserError
 
+
 class NameStringIO(StringIO):
     """In py2.6, StringIO doesn't let you set name because a baseclass has it
     as readonly property"""
@@ -49,6 +49,7 @@ class NameStringIO(StringIO):
     def __init__(self, *args, **kwargs):
         super(NameStringIO, self).__init__(*args, **kwargs)
 
+
 class TestAnsibleLoaderBasic(unittest.TestCase):
 
     def setUp(self):
@@ -283,6 +284,7 @@ class TestAnsibleLoaderVault(unittest.TestCase, YamlTestUtils):
         self.assertFalse(plaintext_var != vault_string)
         self.assertFalse(vault_string != plaintext_var)
 
+
 class TestAnsibleLoaderPlay(unittest.TestCase):
 
     def setUp(self):