[CLI] The UX around changing the cluster-encryption-level should be improved

What's the issue?
Setting the cluster encryption level is something that can be improved, at the moment it's not as clear as it could be.

couchbase-cli setting-security --cluster [::1] --username Administrator --password asdfasdf --set --cluster-encryption-level all

ERROR: clusterEncryptionLevel - Can't set cluster encryption level when cluster encryption is disabled.

This error message doesn't indicate how to change the cluster encryption level (i.e. using 'node-to-node-encryption', from an outside perspective, this link isn't clear at all).

Furthermore, it's likely the user will have to:
1) Disable auto-failover
2) Enabled N2N encryption
3) Re-enable auto-failover
4) Finally update cluster encryption level

Could this be improved/streamlined?