[3007.x] Change log level of successful master cluster key exchange from error to info

[clayoster]

What does this PR do?

Sets the log level of successful master key exchange from error to info.

What issues does this PR fix or reference?

Fixes: #66266

Previous Behavior

Logs indicating successful master key exchange would be logged as errors

New Behavior

These logs will not be seen unless the master is running with a log_level of info

Merge requirements satisfied?

[NOTICE] Bug fixes or features added to Salt require tests.

• Docs
• Changelog - https://docs.saltproject.io/en/master/topics/development/changelog.html
• Tests written/updated

Commits signed with GPG?

Yes

[whytewolf]

so, 2 things. first I don't think this should be debug. info maybe. as this important information to have beyond debugging purposes. one could even argue for warning as this isn't an error but a warning of where the information is going.

second it does need tests to make sure it is logging at the correct level.

[clayoster]

@whytewolf - Thanks for the input, I do think info makes more sense. I'll update the PR accordingly and find some time to work on tests.