[Proxy examples] Better names for load-balancer and cluster-ip

[k-wall]

In the examples, the customer is prompted to do as

oc apply -k (load-balancer|cluster-ip)

where those names refer to how the proxy is exposed to the network. We do have some explanation about
this in the example's e.g. readme but this still might be bemusing to a customer who just want to try a use-case.

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          I think your motivation is reasonable and I struggle to think of another way to achieve it. I think maybe rename cluster-ip to on-cluster and load balancer to off cluster so that distinction is obvious to users?

I still think they are orthogonal to the filter examples.

Originally posted by @SamBarker in #504 (comment)