Some applications, such as k8s, require a base64 encoded string.
This patch updates the passphrase catalog such that the user can
specify to use base64 encoding on one or more passphrases found in
the passphrase catalog.
We add that support by:
1. Updating pegleg.engine.catalogs.passphrase_catalog to include a
method which determines what encoding type to use, if any.
2. Updating pegleg.engine.generators.passphrase_generator.generate
to encode the passphrase in base64 if detected. This change is
designed to easily add other supported encoding methods in the
future if desired.
3. Updating tests.unit.engine.test_generate_passphrases to
demonstrate that the encoding field in passphrase catalog is
being used, and that the resultant passphrase is in fact base64
encoded. Also show that when encoding type is not specified, or
is set to 'none' that base64 encoding does not take place.
4. Updating tests.unit.engine.test_generate_passphrases to
demonstrate that the encoding field in passphrase catalog is
being used, and that the resultant passphrase is in fact base64
encoded. We also demonstrate the flow from original passphrase
to bytes, to base64 encoded, to encrypted, and back again yields
the expected values at each step of encoding/decoding/encryption
and decryption.
Change-Id: I47c740ca13be57ed74b6780f80c90b39e935708b
5a58ba807a