ipapython.secrets: Port to Python 3

StringIO was renamed in Python 3. The import was was unused,
so remove it.

Files need to be opened in binary mode if bytes are written to them.
(For Python 2: on Linux, there's no practical difference between
text and binary mode)

Reviewed-By: Tomas Babej <tbabej@redhat.com>

ipapython/secrets/store.py

@@ -11,7 +11,6 @@ import ldap
 import os
 import shutil
 import sys
-import StringIO
 import tempfile
 
 

ipatests/test_ipapython/test_secrets.py

@@ -31,7 +31,7 @@ class TestiSecStore(unittest.TestCase):
         cls.cert2db = os.path.join(testdir, 'cert2db')
         os.mkdir(cls.cert2db)
         seedfile = os.path.join(testdir, 'seedfile')
-        with open(seedfile, 'w') as f:
+        with open(seedfile, 'wb') as f:
             seed = os.urandom(1024)
             f.write(seed)
         subprocess.call(['certutil', '-d', cls.certdb, '-N', '-f', pwfile])