DDSSEC11 — Correct Figure 9 to match description of the authentication protocol

The description of the authentication protocol in 8.3.2.7 states that when a step in the authentication fails the plugin should revert back to the state it was before. This prevents a third party from interfering with the authentication and making it fail.

However Figure 9 (Authentication plugin interaction state machine) does not show that. Instead it shows the state machine transitioning to the Final State. This should be corrected.

Update Figure 9 (Authentication plugin interaction state machine)

Update Figure 9 to show that failure of any step does not exit the state machine. Rather the state reverts to the previous one. The state machine is exited only on a successful authentication or on a timeout.

Add additional states to handle the VALIDATION_PENDING_RETRY return from the operations on the Authentication plugin.