jira python83: unicode names and passwords should be encoded as utf8, with test

pymongo/database.py

@@ -363,7 +363,7 @@ class Database(object):
             raise TypeError("username must be an instance of (str, unicode)")
 
         md5hash = _md5func()
-        md5hash.update(username + ":mongo:" + password)
+        md5hash.update(username.encode('utf-8') + ":mongo:" + password.encode('utf-8'))
         return unicode(md5hash.hexdigest())
 
     def authenticate(self, name, password):

test/test_database.py

@@ -227,6 +227,8 @@ class TestDatabase(unittest.TestCase):
                          u"cd7e45b3b2767dc2fa9b6b548457ed00")
         self.assertEqual(db._password_digest("mike", "password"),
                          db._password_digest(u"mike", u"password"))
+        self.assertEqual(db._password_digest("Gustave", u"Dor\xe9"),
+                         u"81e0e2364499209f466e75926a162d73")
 
     def test_authenticate(self):
         db = self.connection.pymongo_test