issue2551251 - migrate pbkdf2 passwords ... test fixes and doc update Fixed a couple of tests where calls to needs_migration() was missing its config parameter. Documented need to update config.ini's password_pbkdf2_default_rounds.

#!/usr/bin/env python
from __future__ import print_function
import zlib, base64, sys
print(base64.encodestring(zlib.compress(sys.stdin.read())))