Commit
df3b1c94cc8a4a007cfe4799f35e05a53e8d1613
by jdetiberUPSTREAM: 44113: vendor: Update elazarl/goproxy to fix e2e test with
go1.8
This updates the dependency github.com/elazarl/goproxy to include this
fix elazarl/goproxy@c4fc265 which makes kubernetes e2e tests build with
go1.8. It was crashing before as described in
https://github.com/elazarl/goproxy/issues/188#issuecomment-281092250 and
https://github.com/kubernetes/kubernetes/issues/38228
(commit: df3b1c9)