CASSANDRA-17805: Check that the replacing node is alive during host r…

[frankgh]

…eplacement

Add a new check during host replacement. Currently, during a node replacement, we check that the node has not updated gossip for a configured ring_delay amount of time (defaults to 30 seconds). In CASSANDRA-17776, the delay is calculated from the max value between the BROADCAST_INTERVAL and 2X the configured ring_delay.

If we see an update from the node that we are replacing in less than the calculated sleep delay, we throw a UnsupportedOperationException with message Cannot replace a live node..... However, we never check whether the node is reporting as alive or not alive. In this commit, we add the check to ensure that the node is in fact reporting as alive before throwing the exception. Additionally, we add logging information with values for the token, updateTimestamp, and allowedDelay values for better reporting.