[1.6.x] Fixed #22364 -- Sanitized getpass input in changepassword.

Python 2 getpass on Windows does not accept unicode, even
when containing on ASCII characters. Related #190807.

Backport of b5a9166f7e from master

django/contrib/auth/management/commands/changepassword.py

@@ -6,6 +6,7 @@ from optparse import make_option
 from django.contrib.auth import get_user_model
 from django.core.management.base import BaseCommand, CommandError
 from django.db import DEFAULT_DB_ALIAS
+from django.utils.encoding import force_str
 
 
 class Command(BaseCommand):
@@ -18,7 +19,7 @@ class Command(BaseCommand):
     requires_model_validation = False
 
     def _get_pass(self, prompt="Password: "):
-        p = getpass.getpass(prompt=prompt)
+        p = getpass.getpass(prompt=force_str(prompt))
         if not p:
             raise CommandError("aborted")
         return p

docs/releases/1.6.3.txt

@@ -64,5 +64,8 @@ Other bugfixes and changes
   environment variable wasn't set
   (`#22256 <http://code.djangoproject.com/ticket/22256>`_).
 
+* Fixed :djadmin:`changepassword` on Windows
+  (`#22364 <https://code.djangoproject.com/ticket/22364>`_).
+
 Additionally, Django's vendored version of six, :mod:`django.utils.six` has been
 upgraded to the latest release (1.6.1).