The ITCMLocalLB.VirtualServer.delete_virtual_server call
takes a ITCMCommon.IPPortDefinitionSequence, rather then
ITCMCommon.IPPortDefinition. Not sure why this is, although as
a convenience function it makes sense. However, I would suggest
to either name it delete_virtual_servers, or change the call
to not take a sequence.
I also think it would be nice to add the ability to delete multiple
instances to pools, rules, proxies, etc.