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/utils/vars.py

@@ -28,7 +28,7 @@ from ansible.compat.six import iteritems, string_types
 from ansible import constants as C
 from ansible.errors import AnsibleError
 from ansible.parsing.splitter import parse_kv
-from ansible.utils.unicode import to_unicode, to_str
+from ansible.module_utils._text import to_native, to_text
 
 
 def _validate_mutable_mappings(a, b):
@@ -49,11 +49,12 @@ def _validate_mutable_mappings(a, b):
             try:
                 myvars.append(dumps(x))
             except:
-                myvars.append(to_str(x))
+                myvars.append(to_native(x))
         raise AnsibleError("failed to combine variables, expected dicts but got a '{0}' and a '{1}': \n{2}\n{3}".format(
             a.__class__.__name__, b.__class__.__name__, myvars[0], myvars[1])
         )
 
+
 def combine_vars(a, b):
     """
     Return a copy of dictionaries of variables based on configured hash behavior
@@ -68,6 +69,7 @@ def combine_vars(a, b):
         result.update(b)
         return result
 
+
 def merge_hash(a, b):
     """
     Recursively merges hash b into a so that keys from b take precedence over keys from a
@@ -95,10 +97,11 @@ def merge_hash(a, b):
 
     return result
 
+
 def load_extra_vars(loader, options):
     extra_vars = {}
     for extra_vars_opt in options.extra_vars:
-        extra_vars_opt = to_unicode(extra_vars_opt, errors='strict')
+        extra_vars_opt = to_text(extra_vars_opt, errors='surrogate_or_strict')
         if extra_vars_opt.startswith(u"@"):
             # Argument is a YAML file (JSON is a subset of YAML)
             data = loader.load_from_file(extra_vars_opt[1:])
@@ -111,6 +114,7 @@ def load_extra_vars(loader, options):
         extra_vars = combine_vars(extra_vars, data)
     return extra_vars
 
+
 def load_options_vars(options):
     options_vars = {}
     # For now only return check mode, but we can easily return more
@@ -118,6 +122,7 @@ def load_options_vars(options):
     options_vars['ansible_check_mode'] = options.check
     return options_vars
 
+
 def isidentifier(ident):
     """
     Determines, if string is valid Python identifier using the ast module.
@@ -148,4 +153,3 @@ def isidentifier(ident):
         return False
 
     return True
-