The NodePort functionality can be tested within the cluster.
Testing from outside the cluster assumes that there is connectivity
between the e2e.test binary and the cluster under test, that is not
always true, and in some cases is exposed to external factors or
misconfigurations like wrong routes or firewall rules that impact
on the test.
Change-Id: Ie2fc8929723e80273c0933dbaeb6a42729c819d0
f333e5b4c5