Support for using existing vault secrets without rundeck headers

If the option "rundeck.storage.provider.1.config.storageBehaviour=vault" is defined on rundeck-config.properties, then the plugin will work without rundeck headers.
So, it this case, existing secrets key/values on vault can be read/update on rundeck.

First Release

1.0.0

Fixing some bugs to get the list of keys on the job page, and fixing …