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/filetree.py

@@ -22,12 +22,6 @@ import pwd
 import grp
 import stat
 
-from ansible.plugins.lookup import LookupBase
-from ansible.utils.unicode import to_str
-
-from __main__ import display
-warning = display.warning
-
 HAVE_SELINUX=False
 try:
     import selinux
@@ -35,6 +29,11 @@ try:
 except ImportError:
     pass
 
+from ansible.plugins.lookup import LookupBase
+from ansible.module_utils._text import to_native
+
+from __main__ import display
+
 
 # If selinux fails to find a default, return an array of None
 def selinux_context(path):
@@ -43,7 +42,7 @@ def selinux_context(path):
         try:
             # note: the selinux module uses byte strings on python2 and text
             # strings on python3
-            ret = selinux.lgetfilecon_raw(to_str(path))
+            ret = selinux.lgetfilecon_raw(to_native(path))
         except OSError:
             return context
         if ret[0] != -1:
@@ -60,7 +59,7 @@ def file_props(root, path):
     try:
         st = os.lstat(abspath)
     except OSError as e:
-        warning('filetree: Error using stat() on path %s (%s)' % (abspath, e))
+        display.warning('filetree: Error using stat() on path %s (%s)' % (abspath, e))
         return None
 
     ret = dict(root=root, path=path)
@@ -74,7 +73,7 @@ def file_props(root, path):
         ret['state'] = 'file'
         ret['src'] = abspath
     else:
-        warning('filetree: Error file type of %s is not supported' % abspath)
+        display.warning('filetree: Error file type of %s is not supported' % abspath)
         return None
 
     ret['uid'] = st.st_uid