The fix for
MB-45110 in ns_server allows nodes that already regularly failed over to be subsequently unsafely failed over. We should permit this also in the CLI. Essentially if the --force option is passed to the CLI when failover is invoked, we should permit it to be applied to nodes that are in the inactiveFailed state. This is needed so clusters don't get stuck as they can do as described in MB-45110.
1. Create a 5 node cluster: .137, .138, .139, .140, .142
2. Stop-server on .140 and when the node becomes unresponsive, fail it over, but don't rebalance it out yet.
3. Now stop server on .138, .139 nodes.
4. --force failover of node .138, .139 and .140