At the moment, the examples produce warnings, due to the very old format
they use.
This commit re-encrypts the example files to eliminate the warnings that
are occurring from the use of the very old sops format.
Commit e9b9f7aeef generated new PGP keys
for this repository, but failed to update the keys used by the examples.
As a result, the documentation for testing with the dev pgp key does not
work.
This commit rekeys the examples using the newly generated examples,
which allows the testing to work again.
This patch changes the behavior of `-r` to make it behave like the
encrypt, decrypt or editing mode: it is now a full roundtrip over an
existing encrypted file that decrypts, creates a new data key, encrypts
and encrypts the data key with all master keys. This new mode makes it a
lot easier to rotate data keys without having to edit files.
