OWLS-93072 - Improve domain status failure message to include retry stage and fatal condition

[ankedia]

Changes to domain status message for following conditions -

1. When retries exceed the max limit, add "introspect failure retry count exceeded error" to the domain status message.
2. In case of a fatal error, include the fatal status in the domain status message.
3. For non-fatal retries, indicate the current retry stage i.e. "Introspection failed on try 1 of x".

[tbarnes-us]

LGTM. Note that this would be easier to review if it was consolidated with Johnny's pull in the same area.

[russgold]

LGTM. Good unit tests and clean up.