* Allow returning list information and other data in 404s.
On read it'll output data and/or warnings on a 404 if they exist. On
list, the same behavior; the actual 'vault list' command doesn't change
behavior though in terms of output unless there are no actual keys (so
it doesn't just magically show other data).
This corrects some assumptions in response_util and wrapping.go; it also
corrects a few places in the latter where it could leak a (useless)
token in some error cases.
* Use same 404 logic in delete/put too
* Add the same secret parsing logic to the KV request functions
This PR fixes the error handling in the api packages logical.Unwrap
method. Previously if there was an error making the request to Vault,
the error was only returned if there was an HTTP response and the status
code was not a 404.
The new code returns all errors but does special case handling if the
response code is a 404.
backends for the moment. This is pretty simple; it just adds the actual
capability to make a list call into both the CLI and the HTTP handler.
The real meat was already in those backends.