Gets information about a secret.
The 'callback' parameter specifies a function which will be called when the operation completes (or an error is encountered). If the 'callback' parameter is not specified, then the method will block and will not return until the operation completes (or an error is encountered).
The callback for this method is defined as:
'err' is the error that occurred. If there was no error, then 'err' is 'null'.
'err' has 2 properties which hold detailed information:
This method gets information about the secret specified by SecretName.
When the information is returned, the class clears the Secret* properties and repopulates them with a single item that contains the secret's information, and also repopulates the Label* properties. The SecretList and LabelList events are also fired.