FIXES: cisco_redundancy.py crash on undefined swact_reason

[thl-cmk]

cisco_redundancy.py crashes if it encounters an undefined swact_reason code. This will change this to output "unkown ()" insted

For more details see https://forum.checkmk.com/t/redundancy-framework-status-switchover-tabula-rasa-check-failed/40194/2

[si-23]

Hi, thank you for uploading a PR. Please rebase on current master due to some conflicts.

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