* Delete ConfidentialStoreRule

* Also delete MockSecretRule so Secret.fromString works

* Secret.SECRET still referenced by SecretHelper in jenkins-test-harness, used by RekeySecretAdminMonitorTest, also copied in publish-over-*-plugin

* RSAConfidentialKey ought to use the same SecureRandom as the ConfidentialStore; this also lets the mock use a fixed seed

* For now ConfidentialStore.secureRandom can be abstract

* Some core unit tests can be rather verbose; set maven.test.redirectTestOutputToFile

* Looks like we need a ConfidentialStoreRule after all

* Restored another couple of usages