Adds debug and warn logging around AWS credential chain generation,
specifically to help users debugging auto-unseal problems on AWS, by
logging which role is being used in the case of a webidentity token.
Adds a deferred call to flush the log output as well, to ensure logs
are output in the event of an initialization failure.
* Add password_policy field
* Updated vault-plugin-secrets-azure to v0.6.1
* A bunch of other libraries also got updated at the same time because of the plugin update
