Werk #2473: cisco_asa_failover: Reworked check to reflect expected primary/secondary states of devices

The check was keeping the current cluster/node states which the devices had during service discovery as reference state and checks whether or not this state remains and raises an error when the state changed.

This has been changed now. The state during discovery is not relevant anymore. The check now looks at the primary/secondary devices and checks whether or not the primary device is the active one or the secondary has been promoted to be the active one. This should be clearer for users.

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