[JENKINS-28319] encrypt the client secret

[johnpneumann]

Encrypts the client secret and uses HudsonTestCase to get around mocking out Secret.

[samrocketman]

This looks OK to me +2. I'll leave it open a bit for other interested eyeballs. I'd say this supersedes PR #50 and fixes [JENKINS-28319].

Please amend your commit message to include [JENKINS-28319] so it is more clear when using git log.

[johnpneumann]

Amended the commit message. Thanks @samrocketman.

[jenkinsadmin]

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[johnpneumann]

@samrocketman - Just checking on the status of this. Don't want it to get stale.

[samrocketman]

Ah, thanks for the reminder. I'll focus on it this weekend (or evenings before the weekend when I get time).

[samrocketman]

I have tested this. Works well. Secret.fromString() does the right thing so no migration is required.

[johnpneumann]

Thank you sir.

[samrocketman]

I plan to release this weekend.