cmd/fscrypt/commands: allow disabling recovery passphrase (#193)

While it's important to generate a recovery passphrase in the linked
protector case to avoid data loss if the system is reinstalled, some
people really don't want it (even though it can be safely ignored as it
almost certainly has far more entropy than the login passphrase).

As a compromise, prompt for y/n before generating it, with default y.
Also, to allow disabling the recovery passphrase during noninteractive
use, add a --no-recovery command-line option.

Update https://github.com/google/fscrypt/issues/186

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