k-toyoda-pi: Fix golint failures of test/e2e/common/[p-r]*

JobBuild
77852
05-27 00:00
028cd65d
05-26 23:58
pull-kubernetes-bazel-build 1132798189783486464
pull-kubernetes-bazel-test 1132798189787680768
pull-kubernetes-dependencies 1132798189787680769
pull-kubernetes-dependencies-canary 1132798189787680770
pull-kubernetes-e2e-gce 1132798189791875072
pull-kubernetes-e2e-gce-100-performance 1132798189791875076
pull-kubernetes-e2e-gce-device-plugin-gpu 1132798189791875074
pull-kubernetes-e2e-gce-rbe 1132798189791875073
pull-kubernetes-integration 1132798189787680771
pull-kubernetes-kubemark-e2e-gce-big 1132798189791875077
pull-kubernetes-node-e2e 1132798189791875075
pull-kubernetes-typecheck 1132798189791875078
pull-kubernetes-verify 1132798189796069376