"juju credentials --show-secrets" doesn't show secrets when using tabular output

[Francis Ginther]

I see this with 2.0.1 and 2.1-beta1-xenial-amd64.

Basically, when using tabular format (or when it's not specified), "juju credentials ${CLOUD_NAME} --show-secrets", doesn't show any secrets. When using the other output formats, they are shown. I expect to be able to see secrets when requested regardless of the format.

ubuntu@landscape-xenial:~$ juju credentials scapestack --show-secrets --format yaml
credentials:
  scapestack:
    scapestack:
      auth-type: oauth1
      maas-oauth: [REDACTED]

ubuntu@landscape-xenial:~$ juju credentials scapestack --show-secrets --format json
{"credentials":{"scapestack":{"cloud-credentials":{"scapestack":{"auth-type":"oauth1","details":{"maas-oauth":"[REDACTED]"}}}}}}

ubuntu@landscape-xenial:~$ juju credentials scapestack --show-secrets --format tabular
Cloud Credentials
scapestack scapestack

ubuntu@landscape-xenial:~$ juju credentials scapestack --show-secrets
Cloud Credentials
scapestack scapestack

Also available via: https://pastebin.canonical.com/171477/

[Ian Booth (wallyworld)]

This was a deliberate decision because the credential secret attributes differ depending on the auth scheme used. Tabular output is best suited to information which can be organised into consistent columns.