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d01b264345
The existing test had two problems:
- It only made connections from within the cluster, so for VIP-type
LBs, the connections would always be short-circuited and so this
only tested kube-proxy's LBSR implementation, not the cloud's.
- For non-VIP-type LBs, it would only work if pod-to-LB connections
were not masqueraded, which is not the case for most network
plugins.
Fix this by (a) testing connectivity from the test binary, so as to
test filtering external IPs, and ensure we're testing the cloud's
behavior; and (b) using both pod and node IPs when testing the
in-cluster case.
Also some general cleanup of the test case.