Display RIPs that have been removed due to a failed check

`keepalived` and `ldirectord` both remove RIPs from `ipvsadm` if the healthcheck fails. Would be great if there was a way to display these as down when running `virtual show tcp <VIP>`.

Keepalived implementation may be easier if we can query snmp.

Other option is to parse config and store the RIPs and compare with ipvsadm table.
