python-keyring: weak encryption in keyring

Python Keyring 0.9.1 does not securely initialize the cipher when encrypting passwords for CryptedFileKeyring files, which makes it easier for local users to obtain passwords via a brute-force attack.

Python keyring has insecure permissions on new databases allowing world-readable files to be created

Python keyring lib before 0.10 created keyring files with world-readable permissions.