As in the PR https://github.com/jenkinsci/azure-commons-plugin/pull/4 , currently the SSH credentials in azure-commons calls Secret.fromString to store the intermediate secrets.

This may be called from the slave nodes, where the encryption / decryption may fail as there is no complete Jenkins instance in slave environment.

Steps to reproduce:

1. Install the kubernetes-cd-plugin (version: 0.1.3)
2. Create a username password credential. For the password, use base64 encoded string.
3. Create a job with kubernetes deployment, select the SSH credentials type, and choose the credentials created above
4. Schedule the job to a slave node and it will fail on NPE when it tries to decrypt the password in Secret

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Fixing in progress.