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.

hacking/module_formatter.py

@@ -19,6 +19,7 @@
 #
 
 from __future__ import print_function
+__metaclass__ = type
 
 import os
 import glob
@@ -34,10 +35,10 @@ from collections import defaultdict
 from jinja2 import Environment, FileSystemLoader
 from six import iteritems
 
+from ansible.errors import AnsibleError
+from ansible.module_utils._text import to_bytes
 from ansible.utils import module_docs
 from ansible.utils.vars import merge_hash
-from ansible.utils.unicode import to_bytes
-from ansible.errors import AnsibleError
 
 #####################################################################################
 # constants and paths