Fix egress interfaces script to work on IPI clusters #156

Job	Run time
editorconfig	6s
golden (defaults)	18s
test (defaults)	17s
golden (gcp)	20s
linting (lint_jsonnet)	6s
golden (maxpods)	16s
linting (lint_yaml)	5s
test (gcp)	16s
golden (pidslimit)	17s
linting (lint_adoc)	9s
test (maxpods)	16s
test (pidslimit)	17s
test (machineconfig)	17s
test (remove-machineconfigpool)	17s
golden (machineconfig)	20s
golden (remove-machineconfigpool)	20s
	3m 57s

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