Improvements to digest authentication

In AX-3.8. improvements were made in platform digest authentication and JACE security, as follows:

Platform digest credentials now use a strong, two-way AES-256 encryption technique, utilizing the unique keyring and key material file of the host (JACE).
Platform digest credentials were relocated to a more secure location in the registry of the host platform (e.g. JACE).
Any AX-3.8 JACE controller operating with factory default platform credentials issues warnings seen with an AX-3.8 Workbench platform connection to it, in these areas:
- In the Platform Administration view, a yellow warning box remains in the bottom right area of this view: Factory default platform credentials detected
  This warning remains until you change the credentials to non-defaults, using Update Authentication from this same Platform Administration view.
In the Application Director view, upon station startup a text warning is seen in station output before any other messaging.

Note that related to this change in AX-3.8 digest platform credentials, that station backups no longer store platform credentials which can affect backup restoration behavior. For related details, see AX-3.8 changes to backup dist usage.

Improvements to digest authentication

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