Attempting to rename a list entry via `set` produces confusing results

[jktjkt]

In the example below, port is a list key:

/czechlight-roadm-device:leaf-ports[port='2']> set port 2
/czechlight-roadm-device:leaf-ports[port='2']> set port 4
/czechlight-roadm-device:leaf-ports[port='2']> commit
/czechlight-roadm-device:leaf-ports[port='2']> get
/czechlight-roadm-device:leaf-ports[port='2'] = (list)
/czechlight-roadm-device:leaf-ports[port='2']/port = 2
/czechlight-roadm-device:leaf-ports[port='2']>

I think that "list renames" are not really supported in either NETCONF or RESTCONF or sysrepo, so IMHO it makes sense to simply disallow setting (or deleting, etc) list keys.