Refactor secret generation for python3.

filter_plugins/oo_filters.py

@@ -11,6 +11,7 @@ import pdb
 import random
 import re
 
+from base64 import b64encode
 from collections import Mapping
 # pylint no-name-in-module and import-error disabled here because pylint
 # fails to properly detect the packages when installed in a virtualenv
@@ -672,8 +673,7 @@ def oo_generate_secret(num_bytes):
     if not isinstance(num_bytes, int):
         raise errors.AnsibleFilterError("|failed expects num_bytes is int")
 
-    secret = os.urandom(num_bytes)
-    return secret.encode('base-64').strip()
+    return b64encode(os.urandom(num_bytes)).decode('utf-8')
 
 
 def to_padded_yaml(data, level=0, indent=2, **kw):