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.

lib/ansible/plugins/lookup/url.py

@@ -18,11 +18,11 @@ from __future__ import (absolute_import, division, print_function)
 __metaclass__ = type
 
 
-from ansible.errors import AnsibleError
-from ansible.plugins.lookup import LookupBase
-from ansible.module_utils.urls import open_url, ConnectionError, SSLValidationError
-from ansible.utils.unicode import to_unicode
 from ansible.compat.six.moves.urllib.error import HTTPError, URLError
+from ansible.errors import AnsibleError
+from ansible.module_utils._text import to_text
+from ansible.module_utils.urls import open_url, ConnectionError, SSLValidationError
+from ansible.plugins.lookup import LookupBase
 
 try:
     from __main__ import display
@@ -52,5 +52,5 @@ class LookupModule(LookupBase):
                 raise AnsibleError("Error connecting to %s: %s" % (term, str(e)))
 
             for line in response.read().splitlines():
-                ret.append(to_unicode(line))
+                ret.append(to_text(line))
         return ret